I using the resip 1.8.5, when received an OPTIONS with three "Accept-Contact" headers from IMS client, the resip does not respond it.
STACK | 20121214-112401.625 | RESIP:TRANSPORT | 1848 | UdpTransport.cxx:585 | Scanner rejecting datagram as unparsable / fragmented from [ V4
192.168.2.51:54478 UDP target domain=unspecified mFlowKey=2352 ]
STACK | 20121214-112401.625 | RESIP:TRANSPORT | 1848 | UdpTransport.cxx:586 | OPTIONS sip:+33659890278@192.168.2.8:5080;rinstance=a23a45b82453c0ea SIP/2.0
Via: SIP/2.0/UDP 192.168.2.51:54478;branch=z9hG4bK5C279636
Via: SIP/2.0/UDP 192.168.2.8:5060;branch=z9hG4bK7bfe74d617b1e6cd863fe5fa409373f7333633;rport
Max-Forwards: 69
CSeq: 1 OPTIONS
Content-Length: 0
Accept: application/sdp
Allow: INVITE,UPDATE,ACK,CANCEL,BYE,NOTIFY,OPTIONS,MESSAGE,REFER
User-Agent: IM-client
Accept-Contact: urn%3Aurn-7%3A3gpp-application.ims.iari.rcse.ft
Accept-Contact: urn%3Aurn-7%3A3gpp-application.ims.iari.gsma-is"