I do not have access to the Adtran in this situation, but I am merely looking for any suggestions as to a possible cause. I have a carrier that has brought a SIP connection into the building and uses a TA908e to hand-off as a PRI to the PBX. Occasionally, while there is an active call, at some point in that call, it will show up on another channel of the PRI. For example:
Caller 123-456-7890 calls 234-555-1212. It comes into the phone system on PRI channel 14.
12 Minutes into that call, Channel 19 of the PRI presents a call to the PBX and it is the conversation that is going on in the first call.
The PBX call records show channel 19 receiving a call from 123-456-7890 and calling 234-555-1212.
Now, the first set of parties on the channel 14 are hearing the PBX auto attendant answer and start offering option on channel 19.
When the parties end their calls, both channels on the PRI drop like normal.
It's very strange, we're not sure why this is happening and I don't know how to suggest the carrier find this and troubleshoot it. It's almost as if the Adtran or SIP provider somehow setup a conference to channels 14 and 19 for the outside party.
Does anyone have suggestions?
