[SIPForum-discussion] RPID in ACK

[yasser elazab]

--------------------------------------------------
From: "Raj Jain" <rj2807 at gmail.com>
Sent: Wednesday, June 18, 2008 1:14 PM
To: <raghul82 at yahoo.co.uk>
Cc: <discussion at sipforum.org>
Subject: Re: [SIPForum-discussion] RPID in ACK

> On Tue, Jun 17, 2008 at 6:23 PM, Raghul Prasanna <raghul82 at yahoo.co.uk> 
> wrote:
>>  I have a scenario were calls to Verizon are getting rejected. When I 
>> looked
>> at the ethereal I found that we are sending ACK to 200 OK from Verizon. 
>> But
>> they keep sending us 200 OK and we respond to it everytime and finaly 
>> they
>> time out.
>>
>>
>>
>>  When I checked with Verizon they said that we dont send RPID in ACK. I 
>> have
>> never come across this scenario were RPID needs to be sent in ACK. I 
>> thought
>> its sent in Invite message which we do.
>>
>>
>>
>>  Does anyone know if there is any spec which states that RPID shd be sent 
>> in
>> ACK?
>
> RPID is a long expired internet-draft. Here is a link to the draft:
> http://tools.ietf.org/id/draft-ietf-sip-privacy-04.txt. The table in
> section 6 in this shows that the header is not defined for the ACK
> method. I doubt that RPID missing in the ACK is the reason why you've
> 200/ACK retransmissions. Typically, you have these retransmission
> problems due to messages not reaching the destination or
> transaction/dialog mismatching.
>
> --
> Raj Jain
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