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Sip Proxy Server

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SIP Proxy


SIP Proxy Overview

The IPsmarx VoIP Softswitch Solution is designed to provide service providers with an all-in-one management tool for all various IP telephony services.  The IPsmarx Softswitch VoIP Platform Solution integrates Call Routing Services, Session border controller, Billing, Client Management and a Reporting Platform to provide VoIP-Based Origination and Termination Services.

The IPsmarx VoIP Softswitch Solution incorporates a Softswitch, Billing Server, optional VoIP Hardware (for PSTN-Based termination or origination) and Full Technical Integration. The Softswitch Billing Platform enables you to successfully manage prepaid/postpaid services, Wholesale, Termination, Callback, PC2Phone, IP Phones, Direct DID, DID2IP, IP2IP and a Hosted Callshop in one solution.

The IPsmarx VoIP Softswitch Solution has features that enable ITSPs (Internet Telephony Service Providers)  to provide a variety of solutions.  A few of these enhanced features include:

  • Integration of all VoIP Services all-in-one platform
  • SIP and H323 Compatible  
  • Support protocol conversion (SIP to H323 and H323 to SIP)
  • Support all available codecs: G729,G723, G711 a, G711 u , H264, H264 (Pass-thru Mode)
  • Support all DTMF Mode (In-band, Out-band, RFC2833)
  • User Defined Caller-ID
  • Scalability & Reliability
  • Class 4 wholesale add-on
  • Class-5 SIP-Based Residential add-on
  • Calling Card add-on Module
  • Compatible with SIP/H323 standard boxes (Cisco, Quintum, Nextone, Linksys, Grandstream,  Sipura, and many others)
  • Allow rapid entry into the VoIP market with a minimal investment
  • …and many more!

IPsmarx also provides a complete integration between the Calling Card Solution and the VoIP Softswitch Solution.

The IPsmarxVoIP Softswitch Solution is a fully-featured, centrally managed platform that consists of the three different components.  These components can be categorized as: GUI and Front-End, IPsmarx Billing and Provisioning, and Back-End and Database. For a detailed diagram, click here

sip proxy

SIP Proxy Key Features


The IPsmarx Carrier Grade Softswitch comes fully equipped with the following features.


Core Features

System Management Features

Billing Features

Reporting Features


Distributed Architecture with TLS Security

To ensure reliability, IPsmarx softswitch solution has been designed with distributed architecture as seen in the diagram. By using TLS, Transport Layer Security, critical data remains secure during transfer.
Click to enlarge

SIP Proxy with Topology Hiding

Signaling for SIP traffic is handled by the IPsmarx SIP proxy server.  Based on the proxy settings the server will choose which carrier the SIP device will use.  For enhanced security, it will also hide the IP addresses of the sender from the IP addresses of the receiver. This feature is also called Topology Hiding. IPsmarx SIP proxy server is SIP RFC 3261 compliant.


SIP & H323 Carrier Support

Our softswitch supports both SIP and H323 protocols, allowing carriers to interconnect with providers and customers regardless of their call control protocol. The correct port for each protocol can be assigned automatically. This can also be changed manually to any port requested by the end point carrier. Our H323 module supports Fast Start capability. Note: H323 support must be added to the softswitch as an add-on module.

Instant SIP & H323 Protocol Conversion

This feature enables the softswitch to link calls between VoIP providers using incompatible protocols. The softswitch views the incoming protocol being used and looks at the outgoing protocol being requested and then changes the protocols required without any disruption of call quality. Note: H323 support must be added to the softswitch as an add-on module.


Fax & Video Support

Carriers have a competitive edge using the IPsmarx softswitch that can accept fax and video in pass thru mode.

Complete Codec Support

To increase interconnection opportunities for VoIP carriers, the IPsmarx softswitch supports all major codecs including G729, G723, G711a, G711u, h464, and h464 in pass-thru mode and via codec negotiation.  The IPsmarx platform also supports  DTMF according to  RFC2833. Since IPsmarx platform supports codec negotiatioan , there is no need for any codec settings at the client or carrier side and this feature makes IPsmarx platform even easier to manage.

Port Limitation Support

With this feature, administrators can limit the number of ports each of their customers and end point carriers may use.

Prefix Based Routing

This feature allows Carriers to define a tech-prefix for each client and set that tech-prefix in the dialing plan to a special carrier / route. The result will be routing the call based on the defined tech-prefix.

Priority Based Routing

This feature allows Carriers to define a priority for each entity in the dialing plan and IPsmarx routing engine will follow these priorities every time that it wants to send a call to an end-point carrier.

Unlimited End-Point Carrier Support

The IPsmarx softswitch allows administrators to define an unlimited number of end-point carriers in order to take advantage of the best price and quality the market has to offer. Fail-over is also included in the softswitch package to ensure that our carrier clients have the most reliable service offering.

Data Encryption for Critical Data Storage

Administrators and end users can rest assured that critical data  will be encrypted using complex encrypting methods such as RSA and MD-5.

Call Monitor

Administrators have access to the call monitor to view live calls any time. IPsmarx’ monitoring tool displays the name of the caller, call destination, type of service, rate, call duration, available talk time, codec being used, and any other information relevant to the call.


Online Back Up Tool

This feature allows administrators to make an online backup from the entire database and save it on an internal or external hard disk.

Automatic Email Notifications

Using this feature, administrators can customize email messages to be automatically sent to their customers. For example, a Pre-paid wholesale customer trigger limit can be created to inform the client when their balance goes below a certain threshold amount.

Application Manager

The IPsmarx Application Manager offers the convenience of system updates, while allowing the flexibility of re-boot by component, resulting in streamlined system management and reduced cost of ownership.

Unified Customer Management

By taking advantage of Unified Customer Management, carriers can offer any other VoIP service supported by IPsmarx, such as IP phone service, calling card, or IP-PBX using the same billing solution and management interface. End users can sign up for any of the services offered using one web interface, and receive one bill for their usage of various services. Administrators and End Users can also set usage limits for each service. For example, they can set one usage limit for calling card and another for wholesale. Note: Service Providers must have appropriate IPsmarx add-on modules to offer additional services.


Enhanced Customer Management

Administrators not only have the ability to define a custom level of access for their customer service representatives, they can also offer an interactive field for employees to add notes for each customer to streamline the customer service process.

Multiple Levels of Access

This feature allows multiple users to be logged in to the softswitch management interface at the same time with different levels of access.  This enables carriers to establish customized levels of access to the softswitch interface. Reports and permissions can be allowed or restricted at the administrator’s discretion.

Integrated RADIUS-based Billing

Our internal RADIUS server for AAA (Accounting, Authorization, and Authentication) procedures guarantees optimal performance and outstanding billing functionality. This feature is compliant with RFC-2865 industry standard.

Minute Rounding & Fee Definition

Using this feature, administrators can establish optional extra fees and minute rounding.  For example, with a 30 by 6 resolution, the caller will be charged for the first 30 seconds regardless of the talk time.  In this scenario, after the first 30 seconds, the caller will be charged in 6 second increments. Administrators can also define fees, such as maintenance or connection fees.

Advanced Taxation System

With the IPsmarx softswitch solution, a third party taxation company is not required. All taxation can be managed in the same management interface. Administrators have the ability to establish multiple tax profiles and manage various taxes.

Promotion Management Tool

By creating customized discounts, promotions, and coupons, carriers are able to offer incentives to their customers using this tool. They can also take advantage of the voucher system supported by IPsmarx to offer prepaid vouchers or promotional codes for their customers. This tool is especially lucrative in regions where credit cards are not widely used.


Flexible Payment Structure

Using our Flexible Payment Structure, administrators are able to manage payments including prepayments and security deposits, while extending credit at their discretion.

Unlimited Rate Table Support

With this feature, administrators benefit from the ability to set up unlimited selling and buying packages, increasing the number of end point carriers and customers they may interconnect with.

Wholesale Billing

Designed for wholesale VoIP carriers who need an all-in-one solution to manage billing, routing, taxation, and complex routing tables, the IPsmarx Wholesale Softswitch offers an unparalleled reliable and user-friendly solution.  

With enhanced security features and our database technology, wholesale VoIP carriers enjoy flexible billing and streamlined rate management through the IPsmarx web-based billing interface.


Security Logs

For enhanced security, the IPsmarx softswitch produces a report that shows logs for all unauthorized attempts on the platform.  Security features of the softswitch will reject any unauthorized login attempt; however a log will be available for system administrators to check the IP address of the unauthorized source.

Flexible CDR Reporting

The CDR, Call Detail Record, is an enhanced reporting tool which enables carriers to view call details, cost, profit, and duration of each call. This report is available per carrier or per customer.

Flexible ASR Report

The ASR, Average Success Rate, enables carriers to evaluate the quality of their termination providers.  The report measures call duration based on carriers, destination, and more. A percentage of the calls being terminated by the system can also be generated, which will aid in determining the quality of end-point carriers.

Flexible ACD Report

The ACD, Average Call Duration, report measures call duration based on carriers or destinations.  This produces a report indicating how long callers are on the phone and generates a time value to measure the quality of end-point carriers.


Add-On Modules

The following add-on modules can be added to enhance IPsmarx softswitch solution.


Class 5 Server

IPsmarx Class 5 VoIP Softswitch Solution is an intelligent, scalable, user friendly application that allows service providers to unify voice and data traffic in one network.  It provides flexible, programmable routing intelligence and includes a management application for switching. IPsmarx Communication Session Server engine allows clients to log on to the system to manage calls, access  IP Gateways and provide complete AAA Billing Solutions for both SIP and H323 customers. 

By adding the Class 5 Server module to the IPsmarx Softswitch, clients may enhance their residential service offering by including in demand features such as voicemail, call forwarding, and call holding.


IP Video Support

Using this feature, IPsmarx Softswitch clients can offer an IP-based video service with high-quality video streaming and secure conference embedded encryption. IPsmarx IP Video allows video signals to be captured, digitized, streamlined and managed over IP networks. 

Calling Card Module

By adding the IPsmarx SIP Based Calling Card Module to the Softswitch, service providers may offer calling card and PINless dialing services. For more information about this award-winning solution and other business models support by the IPsmarx calling card module, please click here

Callback Module

With this feature, service providers can offer ANI, PIN, and Web Callback services. For more information please click here.


Multi-level Callshop Module

The IPsmarx Callshop Module enables service providers to manage multiple callshops or “internet cafes.”  This module also allows the Callshop owner to issue invoices to customers, check CDR and Profit/Loss reports online.  The Callshop is a multi-level module so Callshop owners can have resellers of Callshops, resellers can have agents, and agents can have end-users.  

Direct DID

DID (Direct Inward Dialing) is an emerging technology that has created new business opportunities for service providers.  With the IPsmarx Direct DID Solution calls forward the DID directly to the IPsmarx Softswitch.  The Softswitch initiates a PSTN based call and directs the call to PSTN or GSM based destinations, without routing through an IP phone.  The calls are placed using a landline phone eliminating the need for an IP phone or internet access.  Additionally, service providers can provide international calls at local rates. 


DID2IP Module

DID2IP takes a real phone number (Landline or Cell phone) from a DID provider and forwards the calls to a client that has an IP Phone.  More than one DID number can be assigned to a client.  This service can be provided as a free or chargeable service.  This feature also works with other add-on features such as the Class 5 Server.

Spanish Platform

IPsmarx Platform supports Spanish language for User Interface, End user Portal, IVR, Voicemail and E-store. 



Redundancy is a key component in a fully-featured Softswitch.  The Softswitch must continue functioning at full capacity in the event the primary Softswitch is rendered unavailable.  In the event of a natural disaster, the importance of individual, business and government communications become more critical as the chance of failure to the communications infrastructure increases. 

IPsmarx has created a solution to this problem by deploying an intelligent fully-redundant Class 5 Softswitch offering continuous replication for unmatched resiliency and reliability without user intervention. 

Least Cost Routing

Least Cost Routing is a tool that ensures your calls will go to the lowest cost carrier in your end point carrier list. Through this module you can run LCR and the system will automatically create a Dial plan for your call routing.



With this flexible invoicing module, carriers can send bills manually or automatically, define the frequency of each bill, and export the invoice to PDF format, Microsoft Excel, or Microsoft Word. The IPsmarx invoice formatting tool allows adminstrators to customize the format of their invoices and with unified invoicing, all services that are offered through the IPsmarx platform can be listed on one invoice.

Advanced RTP Management

With this add-on feature, carriers can choose to enable or disable RTP proxy. If the RTP proxy feature is disabled, the RTP stream will be sent directly from the client side to the end end-point carrier. In this case IPsmarx softswitch is not involved in RTP transmission, thus sending the RTP to a separate server. If distributed architecture is used, RTP traffic can be sent to a separate RTP proxy server. By taking advantage of this feature, carriers may reduce the load on their hardware. To view a diagram of our distributed architecture, click here.   

Package Billing

With this feature, carriers can create monthly calling plans and define unlimited minutes or a determined amount of free minutes to specific pre-defined destinations. For example, a carrier may offer a flat fee for a specific number of ports per month.  

Auto Recharge

Carriers can offer hassle-free account management to their customers with the auto-recharge feature. The IPsmarx solution will automatically recharge the account when the balance reaches a pre-defined amount. This feature is only availabe in the United States using Authorize.net merchant account.   


The IPsmarx E-store module is an E-Commerce Solution that is fully integrated with our billing platform. Configuration with a supported merchant account is also included in this module. Using the E-store, you can offer fully automated sign up and online payment for your customers as well as a user portal with access to payment history, call detail records, and account recharge. Design of the front end of the E-store (your homepage) can be fully customized to your company and brand by a certified web designer. 


Reseller Management

With the IPsmarx Unified Reseller Management modules, Administrators can sign up resellers to promote any of their VoIP services. Administrators can define their own reseller program and set permissions, such as sharing or limiting access to the different services they can offer, re-assigning customers to different resellers and allowing resellers to add funds to customers' accounts. There are four types of reseller modules available within the IPsmarx platform, allowing Administrators the flexibility to define their own unique reseller program.

    Usage Based Reseller Module

    A Usage Based Reseller will get compensated through a commission structure set up by the Administrator. This commission can be based on a percentage or a flat rate or both and the commission can be based on long distance calls as they are placed or at the end of the monthly bill. The Usage Based reseller will be able to login to their own interface to manage their customer accounts, but they can only use the service selling rates assigned to them by the Administrator when registering a new account. Reports like CDR, Commission and Balance report can be also available to them if the Administrator has allowed it. If the Administrator allows it, resellers will be able to see and manage each other’s customer accounts. Resellers can also sign up their own subagents. 

    Payment Based Reseller Module

    A Payment Based Reseller will receive compensation through commission set up by the Administrator. This commission can be based on a percentage or a flat rate or both and will be applied as soon as the reseller’s customers add money to their account balance. The Payment Based Reseller will be able to login to their own interface to manage their customer accounts; they can only use the service selling rates assigned to them by the Administrator when registering a new account. Reports like CDR, Commission and Balance report can be also available to them if the Administrator has allowed it. If Administrator allows it, his resellers will be able to see and manage each other’s customers’ accounts. Resellers can also sign up their own subagents. 

    White Label Reseller Module

    Using this module, Rate Based Resellers (white label resellers) have the flexibility to define selling rates for their customers and agents, and their agents are able to define their own selling rates for their customers. This module allows the reseller to set up their own selling rates based on predefined buying rates. The Rate Based Reseller will be able to login to their own interface to manage their customer accounts and create their own service selling rates. Reports, such as CDR, ASR, ACD and Customer Report are also available to them as well as invoicing (as long as the Administrator has this feature enabled). This type of reseller traditionally has their own brand, company name, and logo that is displayed on their own website.  

    Pinless Reseller Module

    The Pinless Reseller module is available to compliment the Payment Based Reseller module. Resellers can utilize this module to sign up customer accounts or recharge customer’s account balance by just retrieving a customer’s phone number and the number they registered will be automatically assigned to the pinless feature. The pinless reseller module offers the advantage of faster registration for when resellers are located in a fast paced customer service environment, such as a convenience or grocery store. The Administrator will have access to the Pinless recharge report for details about total amount recharged per pinless reseller, profit and other information. 

    Reseller E-store

    This feature enables your resellers to have their own branded website. They can display their own logo and their customers can use this complete E-commerce solution to sign up and pay for their services.


Marketing Tools

Whether it’s creating a new service offering, or implementing a new marketing campaign, the IPsmarx solution streamlines the process, allowing your team to focus on marketing strategy instead of lengthy technical implementation. Our suite of integrated marketing tools empowers your marketing team to create promotions, loyalty & referral programs, service & rate packages, manage email campaigns, offer gift cards, and update your website with the latest news and promotional information – all with just the click of a mouse.

    Bonus Points

    This application enables your marketing team to define a point system to encourage customer loyalty. For example, they may define that for every $100 spent, customers can receive 5 bonus points that can redeemed for free minutes, similar to frequent flier miles.

    Referral Program Management

    To encourage customer referrals, this application allows you to reward your customers for referring friends to sign up for this service. Customers who refer friends are eligible to receive a pre-determined number of bonus points that they may redeem for your products and services.

    Email Marketing Tool

    With our integrated Email Marketing Tool, email marketing campaigns can be easily executed from start to finish. You can segment your customers in to various groups in order to send targeted email messages, send the email campaigns directly from the IPsmarx system, and your customers can safely unsubscribe from the campaign if they choose to.

    Message Board

    Your Marketing Team can easily display messages to various customer groups on the customer web portal, making it easy for your customers to find out about your latest news and promotions.

    Promotion Discount Tool

    In conjunction with the IPsmarx E-store, this tool allows you to create competitive ways to position your services, while adding value to your customer’s purchase and driving your online sales. Using this tool, you can create a coupon or a discount equivalent to a dollar value or percentage and asign the coupon or discount to the online services you would like to offer to your customers.



Gift Card Solution

Creating and managing gift cards is easy with our Gift Card Solution. Your customers are also able to redeem gift cards online through our E-Commerce Solution.

Trouble Ticketing System

Our robust ticketing system enables you to manage customer service and support within the IPsmarx platform without the need for a 3rd party application. Your customers can open tickets that can be assigned to various layers (technical support, customer service, sales, etc.) Resellers and agents are also able to open tickets.

Internally, your organization can manage ticket resolution and escalation and also define answers to common questions and email responses that can be saved as templates for efficient response management.

H323 Support Module

For end point carriers who support H323 only, this module can be added to the softswitch to allow interconnection. The correct port for each protocol can be assigned automatically. This can also be changed manually to any port requested by the end point carrier. Fast start capability is another benefit of this feature. SIP and H323 protocol conversion is supported as well. 

Hunt-Stop & Route Suspension

Our reliable Hunt-Stop feature offers peace of mind for carriers that have multiple providers established. For example, if a carrier has three providers, but one provider’s buying rates are more expensive than the selling price for certain destinations, the IPsmarx system can be configured to send calls to the first two carriers and then stop to avoid losing funds. Using Route Suspension, carriers can decide to stop sending traffic to a specific route, to avoid high cost or poor quality.


Auto Provisioning

SIP devices, such as IP phones and adapters are automatically configured using the Auto-Provisioning Module. IPsmarx Auto Provisioning simplifies the installation of a device by transferring the configuration requirements between the provisioning server and the IP phone automatically. The effortless IPsmarx Auto-Provisioning feature for Softswitch is an auto-installation system that consists of two basic functions: learning and setting the IP address and downloading the configuration file, including username and password, for the IP phone. When the IP phone is switched on, the phone connects with the provisioning server, where it is assigned a unique IP address. Some of the popular brands supported by IPsmarx Auto Provisioning include Cisco, Grandstream, Linksys, and Polycom. 

Multi-Dial Plan Module

With the Multi-Dial plan feature, you can have multiple dial plans that are each assigned to a particular service you offer. For example, you could offer two different tiers of VoIP service - a “Premium” quality service and a “Regular” quality service. Each route is able to offer different qualities, yet remain part of the same overall dial plan. This could also be used when testing new carriers, ensuring live traffic routes are uninterrupted.

SIP Card Module

The SIP Card Module allows the System Administrator to generate a batch of residential SIP accounts and export the list of SIP login/passwords information. This information can then be printed on cards. The end user will be able to configure their IP phone, any SIP device or their Softphone with the SIP registrar information to hold an account for Call Termination using VoIP.



  • Operating System: Windows 2003 or 2008, 32 or 64 Bit, English Edition
  • Database: MySQL Server
  • Internet Access: 20 Kbps for each simultaneous call with g729 codec and 1 static, public IP address assigned to the softswitch
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