Hi Daniel,

I checked using the kamcmd command and I see the webrtc connection active. The ACK comes from the webrtc client but somehow kamailio is unable to create a via header and forward the request. The ACK coming from webrtc client is as follows:

SEND: ACK sip:1223@126.128.68.8:5065;transport=udp SIP/2.0

Via: SIP/2.0/WS df7jal23ls0d.invalid;branch=z9hG4bKJ0Qsiuh94B2slPLp19qH;rport

From: "Jayesh"<sip:1000001001@ghanti.com>;tag=vsTKsfB1ZR8EkHTPqzyc

To: <sip:1223@ghanti.com>;tag=UQ9veX0vUg7QS

Contact: "Jayesh"<sip:1000001001@df7jal23ls0d.invalid;rtcweb-breaker=no;click2call=no;transport=ws>;+g.oma.sip-im;+sip.ice;language="en,fr"

Call-ID: 2c76d5ee-e9d0-7f22-8be2-76e80b4ab48b

CSeq: 42684 ACK

Content-Length: 0

Route: <sip:126.128.68.9:5060;lr;sipml5-outbound;transport=udp>

Max-Forwards: 70

Proxy-Authorization: Digest username="1000001001",realm="ghanti.com",nonce="UcFsQ1HBaxc84k4N1J00fpVDj9G57x5p",uri="sip:1223@126.128.68.8:5065;transport=udp",response="5b18a2182c335315875224f2244fb48b",algorithm=MD5

Route: <sip:126.128.68.9:8080;transport=ws;r2=on;lr=on;ftag=vsTKsfB1ZR8EkHTPqzyc;nat=yes>

Route: <sip:126.128.68.9;r2=on;lr=on;ftag=vsTKsfB1ZR8EkHTPqzyc;nat=yes>

User-Agent: IM-client/OMA1.0 sipML5-v1.2013.03.27

Organization: Doubango Telecom

Where 126.128.68.9:5060 is the Kamailio; 126.128.68.8:5065 is a freeswitch playing music and the request is received on 126.128.68.9:8080 which is kamailio acting as a websocket server.

Also the connection between Kamailio and Freeswitch is UDP. I am not able to use the websocket module just because of this small problem caused in signaling. Any help is really appreciated. Could it be related to the nathelper module?

Thanks,

--- Jayesh

On Tue, Jun 18, 2013 at 2:17 PM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

On 6/14/13 4:52 PM, Jayesh Nambiar wrote:

Hello All,

I have a setup which is SIPML5 -> Kamailio(Websocket) -> Freeswitch. All I am trying to do is initiate a call from SIPML5 and Play a Music file from freeswitch. This works, but the call hangs up after 30 seconds due to ACK timeout from from the SIPML5.

What I can see is the SIPML5 from Chrome does send an ACK on websocket, but I see the following error in kamailio syslog:

via_builder(): TCP/TLS connection (id: 0) for WebSocket could not be found

ERROR: <core> [msg_translator.c:1725]: build_req_buf_from_sip_req(): could not create Via header

ERROR: <core> [forward.c:607]: forward_request(): ERROR: forward_request: building failed

ERROR: sl [sl_funcs.c:371]: sl_reply_error(): ERROR: sl_reply_error used: I'm terribly sorry, server error occurred (1/SL)

Can someone help me understand what I am missing here and why kamailio is not able to create a VIA header to forward this request towards freeswitch. I have built a simple config file by following https://gist.github.com/jesusprubio/4066845 as reference.

Any help in understanding this is really appreciated.

looks like the web rtc connection was down (closed by one side or interrupted by the network). You can check with kamcmd the list of active connections.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Training, San Francisco, USA - June 24-27, 2013
  * http://asipto.com/u/katu *

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