[Serusers] non-unique call id problem

[Jiri Kuthan]

it is insane to use the same callid repetatively in UAs but it
is not a big deal for a server to report triple from-tag, callid,
to-tag to make sure the reported value will be unique.

-jiri

At 01:08 PM 7/2/2004, GR S wrote:
>Hello All,
>
>> Greg Fausak <greg at addabrand.com> wrote:
>> I am seeing non-unique call IDs from a UA.
>> SHould I reject a call if the Call-ID is not unique? Has
>> anyone else messed with this? It is a big accounting problem!
>> 
>> Greg Fausak
>
>I apologize if this is an off-topic question, but this is about SIP. Hope folks dont mind...
>
>This thread is a bit old, but i am curious about a comment i saw in the Asterisk SIP channel code.
>It is mentioned that some vendors send multiple calls with the same Call-ID and different tags to
>simplify billing. It also says that it is an overhead for the other *sane* SIP implementations. I
>am learning SIP and dont have much idea about billing, but what makes some vendors think that it
>is easy for billing, where as it is a big problem for some others? What is the right way of doing
>it? How can such differences bring consistancy among different SIP implementations? What method
>does SER follow?
>
>This is from the Asterisk SIP channel code:
>
>        /* In principle Call-ID's uniquely identify a call, however some vendors
>           (i.e. Pingtel) send multiple calls with the same Call-ID and different
>           tags in order to simplify billing.  The RFC does state that we have to
>           compare tags in addition to the call-id, but this generate substantially
>           more overhead which is totally unnecessary for the vast majority of sane
>           SIP implementations, and thus Asterisk does not enable this behavior
>           by default. Short version: You'll need this option to support conferencing
>           on the pingtel */
>
>Regards,
>
>=====
>Girish Gopinath  <gr_sh2003 at yahoo.com>
>
>
>        
>                
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--
Jiri Kuthan            http://iptel.org/~jiri/