[Freeswitch-users] ESL, "181 Call Is Being Forwarded" and voice mail detection

[Marcin S]

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 at 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 at 89.108.20.42:5060;transport=udp
  8  70.590778 192.168.88.237 -> 89.108.20.42 SIP Request: BYE
sip:3c6d5343fb70df3a18f4dd32e7c9d226 at 89.108.20.42:5060;transport=udp
  9  70.625224 89.108.20.42 -> 192.168.88.237 SIP Status: 200 OK
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