Troubleshooting RINGING

If user complains that he does not hear ringing on his device when call is in progress:

1. Configure your phone with same settings as your users and dial same number

If you can hear ringing - advice user to change its device

2. Enable sip debug and full log and look for similar message:

<--- SIP read from 193.138.191.205:64439 --->
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 82.19.82.11:5060;branch=z9hG4bK78d3ff31;rport
From: "37068111854" <sip:37068111854@82.19.82.11>;tag=as1f2d0c9d
To: <sip:281@193.138.191.205:5060>;tag=as1f2d0c9d
Contact: <sip:281@193.138.191.205:5060>
Call-ID: 03f6271f1cac11c45d6d47e67245f804@82.19.82.11
CSeq: 102 INVITE
User-Agent: X-PRO build 1082
Content-Length: 0