todo: We need to implement record-route and route parsing for SIPgate

This means that the way we look at headers we need to support a list
of them.

TODO

@@ -36,3 +36,50 @@ General:
 
 * 3xx, 4xx, 5xx, 6xx are final. We should not allow any other messages.
 Sending multiple 503/500 messages.. they all will be acked..
+
+
+* Record-Route/Route implementation needed:
+
+SIP/2.0 200 OK
+Via: SIP/2.0/UDP 192.168.0.251:3107;branch=z9hG4bK-qvgn1b;rport=3107
+Record-Route: <sip:172.20.40.8;lr>
+Record-Route: <sip:217.10.68.147;lr;ftag=7kypvq>
+From: "sipgate" <sip:ABC@sipgate.de>;tag=7kypvq
+To: "00491778116745" <sip:0049123@sipgate.de;user=phone>;tag=as10fec2f5
+Call-ID: n57q3hl9l7
+CSeq: 1084794278 INVITE
+Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
+Supported: replaces
+Contact: <sip:49123@217.10.77.114:5060>
+Content-Type: application/sdp
+Content-Length: 381
+
+v=0
+o=root 1250091314 1250091315 IN IP4 217.10.77.114
+s=sipgate VoIP GW
+c=IN IP4 217.10.77.114
+t=0 0
+m=audio 17974 RTP/AVP 8 0 3 18 2 101
+a=rtpmap:8 PCMA/8000
+a=rtpmap:0 PCMU/8000
+a=rtpmap:3 GSM/8000
+a=rtpmap:18 G729/8000
+a=fmtp:18 annexb=no
+a=rtpmap:2 G726-32/8000
+a=rtpmap:101 telephone-event/8000
+a=fmtp:101 0-16
+a=silenceSupp:off - - - -
+a=ptime:20
+a=sendrecv
+
+ACK sip:123@217.10.77.114:5060 SIP/2.0
+Via: SIP/2.0/UDP 24.134.59.157:3107;branch=z9hG4bK-2tacy7;rport
+Route: <sip:217.10.68.147;lr;ftag=7kypvq>
+Route: <sip:172.20.40.8;lr>
+From: "sipgate" <sip:ABC@sipgate.de>;tag=7kypvq
+To: "00491778116745" <sip:0049123@sipgate.de;user=phone>;tag=as10fec2f5
+Call-ID: n57q3hl9l7
+CSeq: 1084794278 ACK
+Max-Forwards: 70
+Contact: <sip:abc@24.134.59.157:3107;transport=udp;line=i4p4q6>;reg-id=1;+sip.instance="<urn:uuid:572d1aa1-bfd5-4b8a-ab1e-f9095df386e5>"
+Content-Length: 0