[Freeswitch-users] SIP 100 response and media

Thu Jun 30 21:43:10 MSD 2011

Sorry Boris,

As I do not have access to the device anymore I am unable to check the version.
I remember we started out with 12.4 something and pushed to at least 12.11.

Regards,
Kerem

On Thu, Jun 30, 2011 at 5:54 PM, Boris Kovalenko <boris at tagnet.ru> wrote:
> Hello!
>
>     Thank You, Steve!
>
> Yes, either that or 200 (you can skip ringing to go straight to being
> answered).
>
> Generally with 183/180 you'll get ringback but not hear voice in early
> media, you wouldn't normally hear voice until the 200 OK answers the call.
>
> Media can't start up without SDP in the body of the 180/183/200. SDP
> contains the IP/port used for media and the selected codec. Media can't work
> without those details. Sometimes you'll see 180/183 without SDP there'll
> still be no early media containing ringback, in that case the client'll
> usually generate its own ringback but you'll always see SDP in the 200 OK.
>
> -Steve
>
>
>
>
> On 30 June 2011 13:00, Boris Kovalenko <boris at tagnet.ru> wrote:
>>
>> Hello!
>>
>>     But even reading this RFC, I found that 100 Trying should be followed
>> by one of 18x response to get media channels connected, isn't?
>>
>> Btw, this is the latest SIP spec, better than the draft spec for 183 you
>> posted before.
>>
>> http://www.ietf.org/rfc/rfc3261.txt
>>
>> -Steve
>>
>>
>>
>> On 30 June 2011 09:55, Boris Kovalenko <boris at tagnet.ru> wrote:
>>>
>>> Hello!
>>>
>>> Yes, this is all. INVITE, 100 and RTP. No other SIP messages. So my
>>> knowledge of SIP if right. And customer lies to me or forgot to configure
>>> something :)
>>>
>>> Is that all the signalling?
>>>
>>> 100 Trying only acknowledges the INVITE.
>>>
>>> That *may* be followed by 183 or 180 which'll indicate ringing. The Cisco
>>> would only be able to send early media if that was a 183/SDP or 180/SDP.
>>>
>>> The voice will only start when it sends 200/SDP which is when the call is
>>> answered.
>>>
>>> -Steve
>>>
>>>
>>> On 30 June 2011 06:00, Boris Kovalenko <boris at tagnet.ru> wrote:
>>>>
>>>> Hello!
>>>>
>>>>     I have a customers with Cisco 2821 which want to use IVR on it. He
>>>> has configured Cisco and told me there is no voice when number is
>>>> called. The configuration is:
>>>>
>>>> Cisco 2821 <-- FreeSwitch (full proxy mode) --> PSTN
>>>>
>>>> I looked at tcpdump and the call flow is:
>>>> FS (INVITE) --> Cisco 2821
>>>> Cisco 2821 (100 Trying) --> FS
>>>> Cisco 2821 (RTP) --> FS
>>>>
>>>> I think the call flow is wrong in that case and SIP100 can not go
>>>> throught Freeswitch
>>>> (http://jdrosen.net/papers/draft-donovan-mmusic-183-00.txt) and there
>>>> should be SIP180 to get it work. But customers said this is OK and he
>>>> has no troubles with same configuration with other provider. What may I
>>>> do in this sutiation? Any specific Freeswitch configuration?
>>>>
>>>> P.S. FreeSWITCH Version 1.0.head (git-1c95ad9 2011-01-20 22-43-50 -0300)
>>>>
>>>> --
>>>> Regards,
>>>> Boris
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Join us at ClueCon 2011, Aug 9-11, Chicago
>>>> http://www.cluecon.com 877-7-4ACLUE
>>>>
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>>>
>>>
>>> _______________________________________________
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>>>
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>>>
>>> --
>>> С уважением,
>>>   Борис Коваленко
>>>   ЗАО "Тагнет"
>>>   тел. +7 (3435) 230001
>>>   факс +7 (3435) 230005
>>>
>>> _______________________________________________
>>> Join us at ClueCon 2011, Aug 9-11, Chicago
>>> http://www.cluecon.com 877-7-4ACLUE
>>>
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>>>
>>
>>
>> _______________________________________________
>> Join us at ClueCon 2011, Aug 9-11, Chicago
>> http://www.cluecon.com 877-7-4ACLUE
>>
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>>
>>
>> --
>> Regards,
>> Boris
>>
>>
>> _______________________________________________
>> Join us at ClueCon 2011, Aug 9-11, Chicago
>> http://www.cluecon.com 877-7-4ACLUE
>>
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>>
>
>
> _______________________________________________
> Join us at ClueCon 2011, Aug 9-11, Chicago
> http://www.cluecon.com 877-7-4ACLUE
>
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>
>
> --
> Regards,
> Boris
>
>
> _______________________________________________
> Join us at ClueCon 2011, Aug 9-11, Chicago
> http://www.cluecon.com 877-7-4ACLUE
>
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>

-- 
Kerem Erciyes - Sistem Danismani
http://keremerciyes.com