[Spce-user] Calls comming off hold getting different RTP port

[John Murray]

Hello,

 

We have an upstream PBX - SPCE - downstream PBX.

 

The user on downstream PBX calls user on upstream PBX. While transferring
the call to another user on upstream PBX the caller is put on hold.

 

The hold is a re-INVITE via SPCE to the user on the downstream PBX sending
them 'a=sendonly' in a re-INVITE sdp.

 

In a subsequent re-INVITE the SPCE sends 'a= sendrecv' to take the call off
hold _but_ with a new rtp port.

This confuses the PBX as it does not support rtp port change in a call and
send the audio to the old port giving one way audio.

 

Is there any way to keep the rtp port constant?

 

Many thanks

 

John

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