[Serusers] From-Tag/Call-id not uniq?
Klaus Darilion
klaus.mailinglists at pernau.at
Thu Aug 12 18:31:45 CEST 2004
For IP-PSTN calls:
If you "bad" implemented UAs which use the same call-id and from-tag in
multiple calls, you can distinguish from the to-tag, which will be
generated by your GW and should be correct (that means different for
each call).
regards,
klaus
Arnd Vehling wrote:
> 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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