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Xymphony_Programming_-_SIP_Complications_-_Telesis_System_Behind_A_NAT_Configured_With_Bindings

Usually, configuring the NAT does not need much experience. However, some NATs may not initiate bindings for some SIP messages or they may not perform binding well. It is a complication, which will appear especially for end to end SIP VoIP communication, if the messages containing the private address are routed to the public domain. When the remote endpoint receives the private address, it will attempt to transmit to this address and the connection will fail since these addresses are un-routable in the public domain. As a result the performance the NAT equipment limits the overall performance of the operation.

If the Telesis system is operating behind a NAT equipment with bindings but the NAT equipment fails to translate declared IP addresses in SIP messages sent, then Declare external IP address checkbox should be marked in in SIP voip settings page.

In such case, the Telesis system discovers the public address and declares the source IP address as this one when signaling with non local peer entities. To have proper operation, DNS server IP address in Basic Ethernet settings page should also be set.

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Page last modified on June 02, 2010, at 05:43 AM EST
Subject to change without any notice. All rights reserved 2010 - Telesis A.S.
Iskitler Cad. No.68 Ankara, TURKEY. Tel: +90 312 3840540 Fax: +90 312 3840549 http://www.telesis-pbx.com