[SIPForum-discussion] Collision free Ids: Call-ID, icid-value, Session-ID

volkan kahyaoglu volkankah at hotmail.com
Mon Dec 7 15:03:53 UTC 2009

RFC does not mandate the particular algorithm to be used for the
generation of call-id .... You can use time in milisecond plus a five
digit random string followed by hostname for call-id generation. Do not
disclose any of your personal/server details in this process.


Date: Mon, 7 Dec 2009 14:11:30 +0530
From: gaurav.knangla at gmail.com
To: sipping at ietf.org; sip-implementors at lists.cs.columbia.edu; discussion at sipforum.org
Subject: [SIPForum-discussion] Collision free Ids: Call-ID, icid-value,	Session-ID

Hi there!

Is there an approppriate algorithm like the 'Session-ID generation algorithm' proposed in http://tools.ietf.org/html/draft-kaplan-sip-session-id-02,
for the Call-ID header and icid-value (P-Charging-Vector) param.

another developer attempts to generate an id (vis-a-vis the Call-ID
header and icid-value (P-Charging-Vector) param) using a different
algorithm than the one I've cooked up, I'll have collisions with
their ids, i.e. they will no longer be globally unique.
Is there an appendix with an algorithm in the specs for generating these ids that I'm missing or is this a real problem?

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