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

[Arnd Vehling]

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 ::