27 Jan
2014
27 Jan
'14
1:45 a.m.
Hi
The problem we are having is with processing subscription to reg event at
the S-CSCF - we process SUBSCRIBE messages in ims_registrar_scscf module
and we are seeing to_tag collisions (though never to_tag/from_tag/call_id
collisions) - we process the initial SUBSCRIBE that has no to_tag - we
calculate the to_tag with:
tmb.t_get_reply_totag(msg, &ttag);
and store this as part of the subscription.
It seems that this can return a to tag that is the same even if the
call_id/from_tag of the initial SUBSCRIBE are different.
I'll investigate further today.
Regards
Richard.
On 24 January 2014 18:18, Klaus Darilion <klaus.mailinglists(a)pernau.at>wrote;wrote:
Am 23.01.2014 15:19, schrieb Jason Penton:
Why are we only searching on to-tag? What if there is a collision on the
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hash AND the to-tag is the same for 2+ different
subscriptions. This is
even more likely of happening considering that the hash calculation is
based only on the callid and to-tag...
any comments? Am I missing something here?
Maybe it depends on the totag generation. If this code handles incoming
SUBSCRIBEs and the totag is generated by Kamailio in a unique way, then it
should be safe. If to tags are not generated by Kamailio (and maybe in a
bad way), then there may be collisions, but then may be collisions also on
callid and from-tag, if the clients generate them in a broken way.
regards
Klaus
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