[SIPForum-discussion] Reliable Provisionable Response to the Re-Invite.

[DEEPAK SHARMA]

Hi ,

I Got a doubt here.I guess in case of Re-INVITE, information recvd in 18x
are not sent to end user.Also call is a;ready estd then why UAS will send
any 18x response to Re-INVITE.

In case of INVITE we do not knwo the final response(200 OK) so we send the
18x messages in b/n. But when call has been estd already then why UAS sends
18x again.

Kindly put some light on it !!!!!




On Jan 4, 2008 1:09 PM, <alexzhang at gdnt.com.cn> wrote:

>  Thanks,
>
> So the conclusion is that the re-invite can generate the reliable
> provisionable response from the UAS, just like the initial invite.
>
>
> *Alex Zhang
> ESN: 6-554-8782*
>
>
>  ------------------------------
> *From:* sreekant nair [mailto:sreekant_nair at yahoo.com]
> *Sent:* Thursday, January 03, 2008 11:10 PM
> *To:* Alex Zhang (GDNTRND); discussion at sipforum.org
> *Subject:* Re: [SIPForum-discussion] Reliable Provisionable Response to
> the Re-Invite.
>
>  Hi Alex,
>
> If you mean " Can a Re-Invite generate a 18X response from the UAS?", here
> is what I found in RFC 3261[sec 14.1 pg 86]
>
> Unlike an INVITE, which can fork, a re-INVITE will never fork, and
>    therefore, only ever generate a single final response.  The reason a
>    re-INVITE will never fork is that the Request-URI identifies the
>    target as the UA instance it established the dialog with, rather than
>    identifying an address-of-record for the user.
>
> Sec 14.2 pg 88
>
>    A UAS MAY choose not to generate 180 (Ringing) responses for a re-
>    INVITE because UACs do not typically render this information to the
>    user.  For the same reason, UASs MAY choose not to use an Alert-Info
>
>  header field or a body with Content-Disposition "alert" in responses
>    to a re-INVITE.
>
> Hope that answers your question or at least gives you a pointer in the
> direction you want to go\
>
> Cheers
> Sreekant
>
>
> ----- Original Message ----
> From: "alexzhang at gdnt.com.cn" <alexzhang at gdnt.com.cn>
> To: discussion at sipforum.org
> Sent: Thursday, January 3, 2008 2:52:49 AM
> Subject: [SIPForum-discussion] Reliable Provisionable Response to the
> Re-Invite.
>
> Hi All,
>
> Can a reliable provisionable response be generated for the Re-invite
> message?
> Thanks.
>
>
> *Alex Zhang*
> Guangdong Nortel (GDNT) R&D Center
> GSM/UMTS Voice Core - MSC Design
> Phone: (PSTN)+86 020 89188782 (ESN)6 554 8782
> E-mail: *****alexzhang at gdnt.com.cn* <alexzhang at gdnt.com.cn> YahooIM:
> zcc_nuaa
>
>
>
> -----Inline Attachment Follows-----
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-- 
Thanks
Deepak Sharma
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