Hi

In this case , 200 ok SDP will be converted to be sent in same dialog where
first 180 was sent to A .

If you delay sending 180 to A till some one answers , then think of User A
who has made a call but his
phone screen is in dialling state but no ringback tone heard.Its like
complete silence for him.

As local ringback tone is generated by UE A (by reserving DSP resources)
after getting 180 and played to user.


Regards
Ankur Bansal



On Fri, Mar 18, 2016 at 1:10 AM, Ramachandran, Agalya (Contractor) <
agalya_ramachand...@comcast.com> wrote:

> Hi Ankur,
>
>
>
> I understand your point. But I have a question in Scenario 1. Let’s assume
> that A side fork is not supported.
>
> If proxy forks the call, it receives two 180 Ringing response without SDP.
> If we relay the 1st  180 and if 2nd 180 is consumed by proxy,
> unfortunately the 2nd  person attends the call in Side B(which proxy will
> not be aware when it consumes 180), proxy will relay 200 OK from 2nd
>  person. Now the 180 Ringing sent to side A and 200 OK will have different
> to-tags right?
>
>
>
> Am not clear in this use-case.
>
> That’s why I have asked proxy should forward only the ringing response in
> which call leg it has been answered ?
>
>
>
> Regards,
> Agalya
>
> *From:* ankur bansal [mailto:abh.an...@gmail.com]
> *Sent:* Thursday, March 17, 2016 2:59 PM
> *To:* Ramachandran, Agalya (Contractor) <agalya_ramachand...@comcast.com>
> *Cc:* sip-implementors@lists.cs.columbia.edu
> *Subject:* Re: [Sip-implementors] Query in handling 180 response by proxy
>
>
>
> Hi Agalya,
>
>
>
> Very specific to your scenario for 180 without SDP ,
>
> There can be 2 scenarios based on which it depends whether to send all
> forked 180 or not .
>
> A side fork not supported :First 180 sent and next 180 with different
> to-tag is consumed by proxy
>
> A side fork supported : Both 180s relayed to A.
>
>
>
> >>>>Is this right behavior of proxy or it should forward only the ringing
> response in which call leg it has been answered ?
>
> As mentioned there is no harm in relaying forked 180s if A supports fork,
> later when final success response comes
>
> it can be relayed too.
>
>
>
> Thanks & regards
>
> Ankur Bansal
>
>
>
> On Tue, Mar 15, 2016 at 9:08 PM, Ramachandran, Agalya (Contractor) <
> agalya_ramachand...@comcast.com> wrote:
>
> Hi All,
>
> If an Invite request is received to a proxy, proxy then forks the Invite
> message to two destinations.
> 180 Ringing Response is received from both the destinations to the proxy.
> Proxy is now forwarding both 180 Response to the request originator.
> Is this right behavior of proxy or it should forward only the ringing
> response in which call leg it has been answered ?
> Can anyone clarify me on this.?
>
> Regards,
> Agalya
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementors@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
>
>
>
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