[SIPForum-discussion] Branch and Tag parameters in SIP method

[Nittin Dutt]

Generation of Branch & Tags is implementation dependent provided these met the requirement of unique and random. Branch parameter must be unique for all request sent by UA and must begin with that magic number. Tags must be unique with at least 32 bits of randomness. 

Cheers,
Nittin Dutt

> -----Original Message-----
> From: discussion-bounces at sipforum.org [mailto:discussion-
> bounces at sipforum.org] On Behalf Of andre heller
> Sent: 30 September 2010 12:03
> To: discussion at sipforum.org
> Subject: [SIPForum-discussion] Branch and Tag parameters in SIP method
> 
> Hi SIP forum,
> I have got a basic doubt, which you guys may find very simple,
> but I got to ask.
> I am writing the text based SIP protocol methods for my simple SIP Client
> with methods like INVITE and so, in that I could not come to a conclusion
> of what values should I give for the parameters BRANCH and TAG.
> As far I have read some documentation it only says that BRANCH should
> always start with z9h..... and so on. Is this user defined or generated
> automatically. The same is with TAG as well.
> Can anyone clarify on this topic?
> Regards,
> Andre
> 
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