Posible error in transaction layer.

[Guest <evecchio@integratech.com.ar&]

hi-

looking at branch parameter of Via header field in INVITE and ACK.

the RFC 3261 said:

"The ACK MUST contain a single Via header field, and this MUST be equal to the top Via header field of the original request." at page 129 "17.1.1.3 Construction of the ACK Request".

my proxy server retransmit 200ok until timeout and hangup the call because never receive an ACK.

 

 

INVITE sip:243450030@192.168.0.4 SIP/2.0

Via: SIP/2.0/UDP 192.168.0.55:5070;rport;branch=z9hG4bK5465424

To: <sip:243450030@192.168.0.4>

From: "Emanuel" <sip:243450029@192.168.0.4>;tag=856

Call-ID: 1140978178-424-EMANUEL@192.168.0.55

CSeq: 32 INVITE

Max-Forwards: 20

User-Agent: Express Talk 1.03

Contact: <sip:243450029@192.168.0.55:5070>

Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, INFO, REFER, NOTIFY

Supported: replaces

Content-Type: application/sdp

Content-Length: 281

 

 

ACK sip:243450030@192.168.0.4 SIP/2.0

Via: SIP/2.0/UDP 192.168.0.55:5070;rport;branch=z9hG4bK5466424

To: <sip:243450030@192.168.0.4>;tag=11413226489683348

From: <sip:243450029@192.168.0.4>;tag=856

Call-ID: 1140978178-424-EMANUEL@192.168.0.55

CSeq: 32 ACK

Max-Forwards: 20

User-Agent: Express Talk 1.03

Content-Length: 0