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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