Ringing but no voice from FXS analog phone

[shahulhameed]

Dear Friends,

In my environment, I am implementing VG310, VG204 and VG202 voice gateways they are successfully registered and ring when called, but no voice is heard when calling or receiving calls. SCCP is the protocol I'm using.

I would appreciate your advice.

[neoxbusnext]

it may  use the command  "show call active voice" and "show call active voice brief" to check with IP address between the call leg, it may firewall block RTP or routing problems with End to End RTP. Hope its helps.

[Jitendra Kumar]

you can troubleshoot with the below document..

https://www.cisco.com/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/214636-troubleshoot-and-monitor-analog-ports.html

[shahulhameed]

All phones are working after restarting the voice gateway 310. But still, phones which are connected to voice gateway 204 are not working yet. I am trying to troubleshoot with your guy's provided tips.