We have an interesting problem here and I would greatly appreciate any input or suggestions.
We are using a Neotel SIP connection which uses Fibre as the last mile connection.
Neotel gave us 99 numbers which are all working fine.
We had 3 numbers ported when we moved away from PSTN which were forwarded to our Neotel numbers.
If a Vodacom (cellular provider) calls any of our Neotel numbers, everything works fine.
If a Vodacom subscriber calls one of the ported numbers, the call is disconnected after 39 seconds every time.
This problems doesn’t affect any of the other cellular provider subscribers or any other callers calling from landlines, just Vodacom subscribers.
I assumed it was a problem with Vodacom/Neotel’s porting and they say it is a fault with the Asterisk Configuration.
One of Neotel’s technicians came out and brought with him a testing tool (essentially a mobile PABX) which he connected to our SIP account and sure enough, the calls all worked fine, even Vodacom calls. This means the fault must be somewhere in the Asterisk setup or trunk config.
Neotel’s tech support sent me the following:
"After a deep investigation with Vodacom and switch vendor, It seems that the Asterisk PBX from your side is triggering our SoftX to send the “CON” message due to the type “Auto Answering” that might be configured on your PBX. This causes Vodacom to release the calls. I am still doing more analysis with switch vendor. "
Please could somebody tell me what this means or if there is something I can do to fix it?
Thanks very much!