Setting it to yes forces RFC behavior and enables symmetric RTP support. Setting it to no only enables RFC behavior if the remote side requests it. RFC An Extension to the SIP for. Symmetric Response Routing. (rport: receive port parameter). Page 2. 2. Signal Flow Diagram. Page 3. 7 Apr Application Layer Gateways; STUN (RFC , RFC ) solutions: SBC, symmetric response routing; rport (RFC ).

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Solved: RFC Supported? – Polycom Community

Furthermore, ALG often are activated by default or use different terms e. For those interested, some more details: This is currently supported by neither rfc 3581 telephony systems nor any ITSP we know. Other protocols that query the NAT rfc 3581 for the public address directly are not used widespread due to security considerations UPnP or are still in draft state Midcom.

While typical binding life-time is in the range of 30 to seconds, the typical ITSP re-registration interval is at least seconds, sometimes much longer e. But by far the most pressing problem is that many NAT gateways rather quickly age the temporary state information internal: We use cookies rfc 3581 improve your experience on our website. In addition, the port is changed in many cases.

When Asterisk receives an incoming call, how will it know which private IP-address the client is reachable? Practically all NAT implementations need to store some rcf about their state to recognize response packets and change them accordingly.

Experience shows that some ALGs are badly implemented and for example cannot handle two simultaneous connections, because they mix up the used RTP ports.


These bindings have a time-to-live Rfc 3581 that is implementation-specific and may also depend on the used port number and the count of transmitted packets e. Practically this means that STUN monitors rfc 3581 public address of port by sending out a binding request frequently every 15 seconds.

This is especially a problem for incoming one-way payload rfc 3581.

The o-line also contains rfc 3581 private IP address, but this is not critical for payload establishment. Consider, for example, two phones — This state information is called binding. The NAT gateway creates a UDP state mapping between internal source ports and external source and destination, since most user agents are symmetrical rfc 3581 ports. Rcf GeorgeN, welcome to the Polycom Community.

rvc KG All other company, brand, product and service names are trademarks or registered trademarks of their respective holders. In general it is a bad idea to activate both STUN on the telephony 35881 and ALG on the router at the same time, because they both try to do the same.

A separate parameter to rfc 3581 the RFC behavior would have been better. Rfc 3581 most configurations, the NAT router or firewall then has no open binding and cannot forward the request to the telephony system, so then rfc 3581 example the caller is not released if the callee releases the call.

To achieve this in a multi-proxy environment, every rfd adds a received-parameter containing the source IP address of the received packet to rfc 3581 Via-Header of a SIP message it forwards. The same applies for new requests within the dialog e. Rfc 3581 if the NAT router changes the port, the response cannot be sent back to the client.

Printable version on Facebook. For the first it often helps to change the mode to port preserving rfc 3581for the latter the Auto or Always mode works better.


Settings/enable rport rfc3581

rfc 3581 If you require assistance from Polycom technical support, please open a web service request or call us. This NAT type detection works with most, but not all routers that are available.

Retrieved from ” http: Experience shows that those devices are unreliable very often, so it is best to switch off any ALG functionality. When the rport-Parameter is added by the client to rfx outgoing SIP request, the receiving proxy also fills this parameter rfc 3581 the source port it rfc 3581 in the received UDP header and uses it to route back the responses.

Otherwise it tries to preserve the port and keeps a “port restricted cone NAT” behaviour if this isn’t possible. The result is rfc 3581 in WBM and log files, so it can be used for diagnostics. If the ITSP works in proxy mode and does not add the Record-Route header, there is another problem for these requests:. To address all the problems rfc 3581 above, the ITSP has to support symmetric response routing for.

No binding request is made for ITSP calls.

Asterisk sip nat

Please ensure to provide some efc if rfc 3581 reply has helped you so other users can profit from your experience. For example, a lot of routers try to preserve the rfc 3581 if possible. All forum topics Previous Topic Next Topic. After that, Asterisk already knows where to send its RTP.