ERROR[938][C-00000000]: chan_sip.c:4263 __sip_reliable_xmit: Serious Network Trouble; __sip_xmit returns error for pkt data

Asterisk Asterisk SIP
1

Hi,
due for no solution provided previous topic I would like to open again this topic.
I can make and receive call from Zoiper to Zoiper. But when I change B part to Web (JSSIP) I see below ERROR.

Anyone can explain below ERROR ?

ERROR[938][C-00000000]: chan_sip.c:4263 __sip_reliable_xmit: Serious Network Trouble; __sip_xmit returns error for pkt data

2

This can occur if the websocket connection has been terminated. It has to remain up in order for traffic to flow. Have you confirmed in the browser that it is still up?