I have a PBX Asterisk and also a pair of SIP Lines wich I am using to make the external calls.
The problem is the next:
sometimes i can make the external calls and the message in the Asterisk cli is “Ringing”.
But sometimes i try to make a external call and the message in the Asterisk cli is:
– Called trunk_sip/1001
– SIP/trunk_sip-b7706c40 is making progress passing it to SIP/1020-b7700468
and i listen the tone like if the line was ocuped (“beep beep beep…”)
With the WireShark I see the next:
when the call courses correctly: “180 ringing”
when the call courses wrongly: “183 session progress, with session description”
I don’t know why sometimes I can course the external calls and sometimes not. If somebody can help me i will be very gratefull.