Here 's the problem
From the logs of dispatcher, I have pasted below only one log of dispatcher failure. it
seems to be timeout from microsoft.
Dec 19 06:16:46 curemsteamssbc /usr/sbin/kamailio[30957]: DEBUG: dispatcher
[dispatch.c:3680]: ds_options_callback(): OPTIONS-Request was finished with code 408 (to
sip:sip3.pstnhub.microsoft.com;transport=tls, group 1)
This dispatcher log clearly showing that Option request was finished with 408 from
Microsoft. so it means Kamailio is not receiving back anything from Microsoft for it's
Option request.
what you suggest now ?