No TDM over SIP

[tnjwinters]

I have a CS1000M M/G running 5.0 we are installing a new CS1000E with SIP trunking. IP to IP and IP to TDM work fine but no TDM to TDM over the SIP. You can dial the phone on the far end but not speach path & no lighting of the Message Waiting.

 

[allenmac]

Sounds like 1 end is not assigning a DSP.

 

[xinnam]

I currently have a site with the same issue, the DSP's are fine and if the far end calls the TDM device via SIP there is talk path. I have also found that intermittently if you wait a few seconds on the TDM set you do get talk path.

 

[tnjwinters]

My vendor found a class of service issue on the SIP trunk. It was set to secure, they changed that and its working now. Still a few issues but moving forward.

 

[mancy]

You may check TDM>IP DSP channel avaliable or not?

 

[xinnam]

tnjwinters
Did they change to MSNV in the CLS?

 

[allenmac]

I had a problem very similar to this a while back, and worked with ETAS for 2 days. The solution was to change the SIP transport protocol from TCP to UDP.

The one way speech was being caused by TCP packet fragmentation of the SIP call setup messages. Changing the transport protocol to UDP in Element Manager, and in the NRS cleared it up.