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[reSIProcate] Is Contact header in 180 Ringing Mandatory ?


Hi,
 I am having a problem with my B2BUA using resip. When a client responds
with 180 Ringing ( without contact)  to my INVITE, the resip stack throws an
error saying "Cannot create dialog, no contact in 180".
Is contact mandatory in 180 ? I don't see this in RFC 3261 !

-best regards
Asheesh.