Syrotech SY-GPON-1110-WDONT – BSNL FTTH VoIP Ringing Issue
I am using BSNL FTTH landline with a new Syrotech 1110 WDONT. Internet and voice calling are otherwise working normally, but I am facing a strange issue with outgoing calls to some BSNL mobile numbers.
When I make an outgoing call from the BSNL FTTH landline to certain BSNL mobile numbers, the telephone handset connected to the ONT produces an unusual/incorrect ringing tone instead of the normal ringback tone.
The important point is:
Has anyone using Syrotech 1110 WDONT with BSNL FTTH Voice experienced a similar issue?
Any technical explanation or troubleshooting suggestion would be appreciated.
I am using BSNL FTTH landline with a new Syrotech 1110 WDONT. Internet and voice calling are otherwise working normally, but I am facing a strange issue with outgoing calls to some BSNL mobile numbers.
When I make an outgoing call from the BSNL FTTH landline to certain BSNL mobile numbers, the telephone handset connected to the ONT produces an unusual/incorrect ringing tone instead of the normal ringback tone.
The important point is:
- The same issue occurs on two brand-new Syrotech 1110 WDONT ONTs.
- The issue occurs only with some BSNL mobile numbers.
- Other numbers work normally.
- The actual call may connect normally, but the ringback tone heard on the landline handset is abnormal.
- With my previous ONT, this particular behaviour was not observed.
- SIP/SDP interoperability
- 183 Session Progress / 180 Ringing signalling
- Early media / RTP
- Codec priority
- SIP response handling in the ONT
- DTMF or tone-generation settings
- Syrotech ONT firmware issue
- BSNL Softswitch/NGN/IMS interaction
Has anyone using Syrotech 1110 WDONT with BSNL FTTH Voice experienced a similar issue?
Any technical explanation or troubleshooting suggestion would be appreciated.
