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: 2010000002.

ACK sip:2010000002@10.1.10.65:5060 SIP/2.0

Via: SIP/2.0/UDP 172.16.15.51:5060;branch=z9hG4bK-5fb5b16;rport

From: 2224440133 <sip:2224440133@host.domain.com>;tag=692c5bafde7b5655o0

To: <sip:2224449999@host.domain.com>;tag=3b968d2d

Call-ID: c813c237-8673e16d@172.16.15.51

CSeq: 101 ACK

Max-Forwards: 70

Route: <sip:10.1.10.65;ftag=692c5bafde7b5655o0;lr>, <sip:10.1.10.65;ftag=692c5bafde7b5655o0;lr>

Contact: 2224440133 <sip:2224440133@172.16.15.51:5060>

User-Agent: Linksys/PAP2-3.1.5(LS)

Content-Length: 0

But SER’s loose_route incorrectly modifies this ACK as follows:

ACK sip:10.1.10.65;ftag=692c5bafde7b5655o0;lr SIP/2.0

Record-Route: <sip:10.1.10.65;ftag=692c5bafde7b5655o0;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-5fb5b16;rport=5060

From: 2224440133 <sip:2224440133@host.domain.com>;tag=692c5bafde7b5655o0

To: <sip:2224449999@host.domain.com>;tag=3b968d2d

Call-ID: c813c237-8673e16d@172.16.15.51

CSeq: 101 ACK

Max-Forwards: 16

Route:

Contact: 2224440133 <sip:2224440133@172.16.15.51:5060>

User-Agent: Linksys/PAP2-3.1.5(LS)

Content-Length: 0

Which causes the ACK to keep looping through SER:

ACK sip:10.1.10.65;ftag=692c5bafde7b5655o0;lr SIP/2.0

Record-Route: <sip:10.1.10.65;ftag=692c5bafde7b5655o0;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-5fb5b16;rport=5060

From: 2224440133 <sip:2224440133@host.domain.com>;tag=692c5bafde7b5655o0

To: <sip:2224449999@host.domain.com>;tag=3b968d2d

Call-ID: c813c237-8673e16d@172.16.15.51

CSeq: 101 ACK

Max-Forwards: 15

Route:

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=692c5bafde7b5655o0;lr SIP/2.0

Record-Route: <sip:10.1.10.65;ftag=692c5bafde7b5655o0;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-5fb5b16;rport=5060

From: 2224440133 <sip:2224440133@host.domain.com>;tag=692c5bafde7b5655o0

To: <sip:2224449999@host.domain.com>;tag=3b968d2d

Call-ID: c813c237-8673e16d@172.16.15.51

CSeq: 101 ACK

Max-Forwards: 14

Route:

Contact: 2224440133 <sip:2224440133@172.16.15.51:5060>

User-Agent: Linksys/PAP2-3.1.5(LS)

Content-Length: 0

I am really stuck.

Can anyone tell me what is happening?!

Thanks

ramin