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

[Brian West]

I don't think you will reliably receive a 181 in every case that a call
goes to voicemail.

On Thu, Aug 27, 2015 at 5:20 AM, Marcin S <ms4esl at gmail.com> wrote:

> 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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-- 

*Brian West*
brian at freeswitch.org


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