[Serusers] From-Tag/Call-id not uniq?

[Michael Shuler]

The call-id is supposed to be unique across a complete session i.e.
INVITE/RINGING/OK/ACK/BYE.  If it wasn't then there would be no way to
relate the messages as part of the same sequence/call.

----------------------------------------

Michael Shuler, C.E.O.
BitWise Systems, Inc.
682 High Point Lane
East Peoria, IL 61611
Office: (217) 585-0357
Cell: (309) 657-6365
Fax: (309) 213-3500
E-Mail: mike at bwsys.net
Customer Service: (877) 976-0711 

> -----Original Message-----
> From: serusers-bounces at lists.iptel.org 
> [mailto:serusers-bounces at lists.iptel.org] On Behalf Of Arnd Vehling
> Sent: Thursday, August 12, 2004 10:47 AM
> To: serusers at lists.iptel.org
> Subject: [Serusers] From-Tag/Call-id not uniq?
> 
> 
> Hi,
> 
> according to the RFC:
> 
> "When a tag is generated by a UA for insertion into a request or
>   response, it MUST be globally unique and cryptographically random
>   with at least 32 bits of randomness."
> 
> But when looking at a sip logfile:
> 
> egrep "^From:.*;tag=9d49295bb825210f" /var/log/term.log  | wc -l
> 503
> 
> Question: Did i understood something wrong or is the recoccurance of
> the same tag-id and callid in different sessions voilating the rfc?
> 
> Ive found loads of non-uniq call-ids as well as non uniq tags. How
> is a man supposed to make accounting (besides accounting on the PSTN
> GW/Voice Switch) when those to identifiers are not globally uniq?
> 
> So far ive seen non uniq callids from Grandstream Products 
> and non uniq
> tags from sipura adapters.
> 
>     :: arnd ::
> 
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