Hi Everyone, I am really stuck here. I really need help! I receive the following ACK request in SER from a Linksys/PAP user agent that SER should forward to the destination User Agent: 1234560133. ------------------------------------------------------------------------ --------------------------------------------------- ACK sip:10.1.10.65;ftag=cff8d63370ff3ed5o0 SIP/2.0 Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5b186b5;rport From: 1234560133 <sip:2224440133@host.domain.name>;tag=cff8d63370ff3ed5o0 To: <sip:1234560131@host.domain.name>;tag=26001139010904 Call-ID: 9b54d80b-81b366dd(a)172.16.15.51 CSeq: 101 ACK Max-Forwards: 70 Route: <sip:1234569999@10.1.10.65:5060> Contact: 1234560133 <sip:1234560133@172.16.15.51:5060> User-Agent: Linksys/PAP2-3.1.5(LS) Content-Length: 0 ------------------------------------------------------------------------ --------------------------------------------------- But the loose_route function transforms it to the following and as a result it is routed back to SER and therefore falls into an infinite loop as shown by the couple of ACKs that get looped through SER: ------------------------------------------------------------------------ --------------------------------------------------- ACK sip:10.1.10.65;ftag=cff8d63370ff3ed5o0 SIP/2.0 Record-Route: <sip:10.1.10.65;ftag=cff8d63370ff3ed5o0;lr=on> Via: SIP/2.0/UDP 10.1.10.65;branch=0 Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5b186b5;rport=5060 From: 2224440133 <sip:2224440133@cl1.glphone.com>;tag=cff8d63370ff3ed5o0 To: <sip:2224440131@cl1.glphone.com>;tag=26001139010904 Call-ID: 9b54d80b-81b366dd(a)172.16.15.51 CSeq: 101 ACK Max-Forwards: 16 Contact: 2224440133 <sip:2224440133@172.16.15.51:5060> User-Agent: Linksys/PAP2-3.1.5(LS) Content-Length: 0 ------------------------------------------------------------------------ --------------------------------------------------- ACK sip:10.1.10.65;ftag=cff8d63370ff3ed5o0 SIP/2.0 Record-Route: <sip:10.1.10.65;ftag=cff8d63370ff3ed5o0;lr=on> Record-Route: <sip:10.1.10.65;ftag=cff8d63370ff3ed5o0;lr=on> Via: SIP/2.0/UDP 10.1.10.65;branch=0 Via: SIP/2.0/UDP 10.1.10.65;branch=0 Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5b186b5;rport=5060 From: 2224440133 <sip:2224440133@cl1.glphone.com>;tag=cff8d63370ff3ed5o0 To: <sip:2224440131@cl1.glphone.com>;tag=26001139010904 Call-ID: 9b54d80b-81b366dd(a)172.16.15.51 CSeq: 101 ACK Max-Forwards: 15 Contact: 2224440133 <sip:2224440133@172.16.15.51:5060> User-Agent: Linksys/PAP2-3.1.5(LS) Content-Length: 0 ------------------------------------------------------------------------ --------------------------------------------------- ACK sip:10.1.10.65;ftag=cff8d63370ff3ed5o0 SIP/2.0 Record-Route: <sip:10.1.10.65;ftag=cff8d63370ff3ed5o0;lr=on> Record-Route: <sip:10.1.10.65;ftag=cff8d63370ff3ed5o0;lr=on> Record-Route: <sip:10.1.10.65;ftag=cff8d63370ff3ed5o0;lr=on> Via: SIP/2.0/UDP 10.1.10.65;branch=0 Via: SIP/2.0/UDP 10.1.10.65;branch=0 Via: SIP/2.0/UDP 10.1.10.65;branch=0 Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5b186b5;rport=5060 From: 2224440133 <sip:2224440133@cl1.glphone.com>;tag=cff8d63370ff3ed5o0 To: <sip:2224440131@cl1.glphone.com>;tag=26001139010904 Call-ID: 9b54d80b-81b366dd(a)172.16.15.51 CSeq: 101 ACK Max-Forwards: 14 Contact: 2224440133 <sip:2224440133@172.16.15.51:5060> User-Agent: Linksys/PAP2-3.1.5(LS) Content-Length: 0 I put some debug messages in rr and this is what I get: DEBUG: -ramin- modules/rr/loose_route: jumping to after_strict after_strict: No next URI found It seems as if the after_strict is invoked and it can not find the next URI! Can you please tell me why SER can not route this properly! Thank you so much for your kind help ramin