Hi,

I have a dialer app that uses ESL and freeswitch. I would like to detect when voice mail answers call. For such calls there is a "181 Cal Is Being Forwarded" message in SIP signalization.

However, in ESL there is no event fired (maybe beacuse there was 183 and 180 earlier).

How can I detect, that there was 181 received?

Here is an example sip trace:

1   0.000000 192.168.88.237 -> 89.108.20.42 SIP/SDP Request: INVITE sip:123456789@89.108.20.42, with session description
2   0.018028 89.108.20.42 -> 192.168.88.237 SIP Status: 100 Trying
3   0.418550 89.108.20.42 -> 192.168.88.237 SIP/SDP Status: 183 Session Progress, with session description
4   1.405465 89.108.20.42 -> 192.168.88.237 SIP Status: 180 Ringing
5 29.270672 89.108.20.42 -> 192.168.88.237 SIP Status: 181 Call Is Being Forwarded
6 29.659371 89.108.20.42 -> 192.168.88.237 SIP/SDP Status: 200 OK, with session description
7 29.670833 192.168.88.237 -> 89.108.20.42 SIP Request: ACK sip:3c6d5343fb70df3a18f4dd32e7c9d226@89.108.20.42:5060;transport=udp
8 70.590778 192.168.88.237 -> 89.108.20.42 SIP Request: BYE sip:3c6d5343fb70df3a18f4dd32e7c9d226@89.108.20.42:5060;transport=udp
9 70.625224 89.108.20.42 -> 192.168.88.237 SIP Status: 200 OK