[OpenSIPS-Users] How to calculate branch parameter in VIA

Alireza6918 alireza_karimi63 at yahoo.com
Sat Jul 10 07:53:42 CEST 2010


I don't know how Opensips calculates branch parameter in VIA header field. 
I know the first 7 characters "z9hG4bK" are magic cookie but don't know
about the rest. 
for example in following: 

Via: SIP/2.0/UDP 192.168.10.139;branch=z9hG4bK-2740-1-0..Via: SIP/2.0/UDP
192.168.10.206:5060;branch=z9hG4bK-2740-1-0. 

what is the meaning of 2740-1-0 and how does Opensips calculate this?
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