[SR-Users] PCSCF cannot create via header for sipml5 ACK package

[Serhat Guler]

​Hello,

I finally managed to place a call from sipml5 webrtc client​ to Mercuro IMS
client. The phone rings, and when I answer it sends 200 OK to the sipml5
where as sipml5 send back an ACK message which never passes the originating
PCSCF. The PCSCF says:

 8(3640) WARNING: <core> [msg_translator.c:2729]: via_builder(): TCP/TLS
connection (id: 0) for WebSocket could not be found
 8(3640) ERROR: <core> [msg_translator.c:1947]:
build_req_buf_from_sip_req(): could not create Via header
 8(3640) ERROR: <core> [forward.c:548]: forward_request(): building failed

I doubt that the WebSocket connection is closed, cause when I terminate the
call from Mercuro client a bye request is being sent to the sipml5.

The ACK package:

ACK sip:alice at 192.168.0.10:49794;transport=udp SIP/2.
Via: SIP/2.0/WS
df7jal23ls0d.invalid;branch=z9hG4bKvuly7bmxnN4aqM4zZTIS;rport
From: "Bob"<sip:bob at net1.test>;tag=GxzKy1nCMEI1mR0RztrB
To: <sip:alice at net1.test>;tag=18823
Contact: "Bob"<sip:bob at df7jal23ls0d.invalid
;rtcweb-breaker=no;click2call=no;transport=ws>;+g.oma.sip-im;language="en,fr"
Call-ID: 5a500969-d0fa-14d1-7d0e-8605f4356ca6
CSeq: 3887 ACK
Content-Length:
Route: <sip:192.168.0.11:4060;lr;sipml5-outbound;transport=udp>
Max-Forwards: 69
Route: <sip:mo at 192.168.0.11:880
;transport=ws;r2=on;lr=on;ftag=GxzKy1nCMEI1mR0RztrB;did=e82.0c3>
Route: <sip:mo at 192.168.0.11:4060
;r2=on;lr=on;ftag=GxzKy1nCMEI1mR0RztrB;did=e82.0c3>
Route: <sip:mo at 192.168.0.11:6060
;lr=on;ftag=GxzKy1nCMEI1mR0RztrB;did=e82.f062>
Route: <sip:mt at 192.168.0.11:6060
;lr=on;ftag=GxzKy1nCMEI1mR0RztrB;did=e82.f062>
Route: <sip:mt at 192.168.0.11:4060
;lr=on;ftag=GxzKy1nCMEI1mR0RztrB;did=e82.1c3>
User-Agent: IM-client/OMA1.0 sipML5-v1.2016.03.04
Organization: Doubango Telecom

Have been thinking for quite a while, but couldn't really find a reason why
it wouldn't add the v,a header. A debug 3 level log file is also attached.

Thanks in advance,
Serhat
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