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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