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RTP ProxyRTP Proxy

“Providing seamless interconnect between
VoIP end points, the carrier grade RTP Proxy
enables scalable network hiding and NAT/PAT

 RTP Proxy Overview

SVI RTP Proxy Router

The SVI_RTP Proxy provides

  • NAT/PAT translation allows for public to private address translation.
  • Network topology hiding allowing endpoint IP addresses to be hidden from their IP destination.
  • No decompression/compression of RTP/RTCP packets
  • Real-time set-up via MGCP
  • Support for any codec

The SVI_RTP Proxy Router allows for the dynamic real time configuration of UDP routing between IP networks. This functionality is shown in figure 1, showing a UDP packet from VoIP End Point A being routed to End point B with both IP and Port translation taking place.

The RTP proxy router is controlled via the MGCP protocol over UDP using DNS routing to set up NAT style translations allowing for the routing and alteration of UDP parameters. This provides a seamless interconnect between VoIP end points if direct communication is not possible between these two end points.

RTP Proxy Network Hiding diagram

RTP Proxy NAT Traversal

RTP Proxy Functionality


The RTP Proxy Router provides a simple ASCII test based configuration file that is resident on the router allowing for the set-up of the unit. Configuration options include maximum number of allowable UDP ports, port selection range and protected ports.

Remote Configuration

The RTP Proxy Router provides a telnet and SSH port allowing for remote management of the system. SNMP is provided to allow for the routers to be integrated into an existing SNMP powered management system.


Using MGCP to control the set-up of the routing tables provides inherent redundancy if a failure occurs to a single system. This enables the provision ofan (N+1) redundancy architecture ensuring carrier grade installations.


A single RTP proxy supports 2500 simultaneous sessions with a max of 10,000 sessions on a single unit. To increase the number of simultaneous calls within a system, additional routers can be added in real time allowing for the growth of a system when capacity is required.

RTP Proxy integrated with SVI Softswitch diagram

Carrier Grade RTP Proxy

Squire Technologies has deployed SS7 to VoIP products worldwide and assisted many clients to achieve VoIP interconnect, providing remote or on-site installation and commissioning of products quickly and cost effectively.

Coupled with Squire Technologies post sales support and product enhancement services, allows Squire Technologies to deliver SS7 based signalling products.

For further information on how Squire Technologies can provide an effective RTP Proxy solution click here or download the datasheet below.