SIP MADDR Parameter Population When Public Listen Address Is Not Multicast
Last updated on DECEMBER 20, 2017
Applies to:Oracle Communications Converged Application Server - Version 5.0.0 and later
Information in this document applies to any platform.
Checked for relevance on 06-Jan-2014
When engines are behind load balancer (LB) and public network channel is configured for public listen address as LB IP, OCCAS populates SIP MADDR parameter with LB IP. This is happening for INVITE, BYE, NOTIFY, CANCEL and REFER requests. This creates an issue for external environment such as IMS that is receiving the requests from OCCAS. In that instance IMS reports MADDR contains multicast address and SIP doesn't support multicast. According to RFC 3261 Section 18:
However, OCCAS is adding MADDR even when the public listen address is not a multicast address.
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