`oh-sipclient-card` drops the connection, when the active tab is changed in Firefox, contary to other websockets-browser SIP clients

[dilyanpalauzov]

I connect over SIP and WebSockets and dial +437200101011. This is ENUM service, described at http://enum-test.at/index_en.html.

When I use in Firefox the website https://sip.bapha.be to dial +437200101011, it works (I hear sound), and I continue to hear sound when I switch to a different application (Firefox is not active), or when within Firefox I switch to a different tab. The webpage https://sip.bapha.be is only-browser based, serving static content, apart from the websocket connection, adjusted by https://sip.bapha.be/scripts/config.js, running SIP.js and the actual software is ctxSip, last changed eight years ago.

In openHAB 5.2.0 I configure a SIP widget, without local settings, with

component: oh-sipclient-card
config:
  disableRegister: true
  domain: bapha.be
  enableSIPDebug: true
  password: **hidden**
  phonebook: +437200101011=Music test
  title: Telephone
  username: **hidden**
  websocketUrl: wss://sip.bapha.be/ws/

When I dial the same number +437200101011, I again hear sound. However when I change the active tab in Firefox, or switch to an application, different from Firefox, the sound stops.

The problem report is that oh-sipclient-card should not drop the connection, when the active tab in Firefox is changed, or the active application on the desktop is changed from Firefox to something else. As a different webbrowser-client does not drop the connection, this is a problem in oh-sipclient-card, not in the websockets-server, not a problem of Firefox.

N.B. Sometimes this websocket does not work on the first try, the user has to redial, and then it works.

[florian-h05]

I would propose to add a configuration parameter that allows to enable or disable the behaviour to stay active in the background.
However I wonder what would be the best way to signal an incoming call when the sipclient is in the background … any ideas?

[dilyanpalauzov]

I do not use REGISTER, I do not utilize incoming calls in openHAB, so I have no opinion on what to do, when the sipclient is in the background.

In fact, if I remember correctly, I asked for the option not to do REGISTER, because this REGISTER was performed way too often (on every page reload, tab change, application switch, or alike), without corresponding unregister (in whatever way “unregister” was called). This resulted too-many registrations for the same user on the server and above a threshold the server refused further REGISTER for the same user-id.

Possibly related is reestablishing the websockets connection, when the device orientation changes - openhab/openhab-android#3392.