[SR-Users] WebSocket ping is not being sent

Xuo Guoto xuoguoto at protonmail.com
Fri Mar 11 10:23:05 CET 2022


Yes, I understand that the SIP OPTIONS and websocket pings are different.

I check the ping using two methods. One at the client side using chrome developer tools. At the server side I use sipdump module to capture all traffic.

modparam("sipdump", "enable", 1)
modparam("sipdump", "folder", "/var/log/kamailio/sip/")

With this enabled, kamailio dumps all the traffic in a file for analysis. For example:

tag: rcv
pid: 1553531
process: 16
time: 1646982958.357033
date: Fri Mar 11 12:45:58 2022
proto: tls ipv4
srcip: x9.xx.196.11
srcport: 54640
dstip: 1x8.xx.59.172
dstport: 443
GET /ws HTTP/1.1
Host: myhost-q01.mydomain.net
Connection: Upgrade
Pragma: no-cache
Cache-Control: no-cache
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.3
6 Edg/99.0.1150.36
Upgrade: websocket
Origin: https://myhost-adm.mydomain.net
Sec-WebSocket-Version: 13<snip>

I expect the ping websockets to be printed here, but this is not the only place I am checking for. If pings are being sent, I should get to see it at chrome websocket also. In my case neither place shows any trace of websocket pings packets.


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------- Original Message -------
On Friday, March 11th, 2022 at 2:19 PM, Igor Olhovskiy <igorolhovskiy at gmail.com> wrote:

> Xuo,
> How do you capture this traffic? WebSocket pings is not an ordinary "SIP-style OPTIONS" pings, It's packets described in RFC6455 - https://datatracker.ietf.org/doc/html/rfc6455#section-5.5.2
> чт, 10 мар. 2022 г. в 16:57, Xuo Guoto <xuoguoto at protonmail.com>:
>> Hello list,
>> I have kamailio 5.5.3 (x86_64/linux) configured as an SBC in front of asterisk to front end webrtc clients. Browser clients running JsSIP 3.7.0 connect to kamailio via webrtc and kamailio sends the traffic back to asterisk using SIP. rtpengine is configured to relay the RTP packets.
>> I need to send websocket pings every 10 seconds to the browser clients.
>> I have the following config in kamailio:
>> modparam("websocket", "keepalive_mechanism", 1)
>> modparam("websocket", "keepalive_timeout", 10)
>> modparam("websocket", "keepalive_interval", 2)
>> modparam("websocket", "keepalive_processes", 2)
>> modparam("websocket", "verbose_list", 1)
>> If my understanding of the documentation is correct, I do not need to do any additional configuration.
>> But looking at the websocket traffic, I do not see any ping packets in websocket. I am also using sipdump module to capture all packets sent and received by kamailio and the ping packets are not visible there either.
>> What could be wrong here? Do I need to do any additional config?
>> Thanks for every help!
>> X.
>> __________________________________________________________
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> --
> Best regards,
> Igor
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