Avaya SIP Trunking

[crossmark76]

Hi Guys,

I'm looking for a bit of advise using Session Manager and a FOIP end point server. I am seeing a lot of outbound calls from my FOIP server with high latency and jitter (no packet loss), the result we are seeing is that older receiving fax machines either fail or have degraded fax printouts.

The setup is a UDP trunk (port 5060) from the FOIP server to Session Manager and then we have a TLS trunk (port 5061) between session manager and the ACD (UDP is not possible from what I can see).

The correct codec is being used (G711, T.38, ECM=y, modem off) but I cannot stop these degraded calls....

My questions are -
1. We only have one trunk between session manager and the ACD and this is shared by voicemail and a few other endpoints, can I specific two trunks between session manager and the ACD so segregate the FOIP traffic and play around with it?
2. Anyone have a similar set up and can suggest any improvements or recommendations?

Many Thanks
Mark

 

[DAVIDPAYNE]

Faxing over SIP, not a good idea. OR it is just not relaiable at this point.

 

[kyle555]

Faxing over unreliable IP networks is always a bad idea.

Maybe make sure t38 is not just in the media offer but actually the method of transport.

If by ACD, you mean CM, then you can do things like build different sig groups to SM on different ports or use subdomains on your sig groups. Calls for voicemail would go to/from the domain voicemail.you.com, faxes to faxserver.you.com, etc.

 

[janni78]

If you only have high latency and jitter on calls from your FoIP server then that's the issue, another trunk to SM won't fix that.

"Trying is the first step to failure..." - Homer