[SIPForum-discussion] Why Dialog Id contains both local tag and remote tag?

[Ramakrishnan R]

The calling party creates the 'call-id'. That is unique, and is good enough
identification too. The 'remote-tag' is needed for forking proxies to
identify the responses from multiple end points. But I am not able
understand the need for 'local-tag'. Can any one explain this?

Regards,
Ramki


On Tue, May 24, 2011 at 3:46 PM, Perttu Ahvenainen <
mosseahvenainen at gmail.com> wrote:

> Hello,
>
> SIP dialog is a active dialog between two endpoints. Thats why
> identification of a dialog has to also be "signed" with both endpoints and
> dialog represents peer-to-peer SIP relationship between those two endpoints.
>
> -Perttu Ahvenainen
>
> 2011/5/22 Ramakrishnan R <ram65.vidya at gmail.com>
>
>>
>> Dialog ID is defined as "call-id + local-tag + remote-tag".
>>
>> Is "remote-tag" alone not sufficient ? Why "local-tag" is also needed?
>>
>> Any insights?
>>
>> Thanks & regards,
>>  Ramakrishnan
>>
>>
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