As we know that POTS trunks are usually derived from the PSTN (which is a two-wire service) supports a single call only, that connects to an analog port (FXO) on the Cisco voice gateway.
I will narrate the details below where I will cover how to configure, verify & troubleshoot the FXO ports used to connect to the PSTN.
I will narrate the details below where I will cover how to configure, verify & troubleshoot the FXO ports used to connect to the PSTN.
Configuration
To configure FXO port, you need to gather below information about the circuit that is being installed from the PSTN service provider.
Whether dual tone multifrequency (DTMF) or pulse dialing is necessary.
Whether the trunk requires loop-start or ground-start signaling.
Supervision type: call answer/disconnect supervision indication method (Frequency & Cadence)
Note: Keep in mind Frequency & Cadence value are very important for call disconnection, if frequency & Cadence value mismatch then you will observe FXO port hangs/call stay connected on FXO ports.
voice service voip
allow-connections h323 to h323
supplementary-service h450.12
!
voice class codec 1
codec preference 1 g711ulaw
!
Trunk group for logical grouping of ports, configuration and joint management of multiple Ports
trunk group FXO
voice-class cause-code 1
hunt-scheme longest-idle
!
Below frequency & cadence values used in UAE. You guys can check from your local provider because it’s vary from provider to provider.
voice class custom-cptone UAE-Default
Verifying and Troubleshooting
You can use the show voice all status and show voice port summary for verification
Voice_GW# show voice port summary
PORT CH SIG-TYPE ADMIN OPER STATUS STATUS EC
========= == ============ ===== ==== ======== ======== ==
0/1/0 -- fxo-ls up down idle on-hook y
0/1/1 -- fxo-ls up down idle on-hook y
0/1/2 -- fxo-ls up down idle on-hook y
0/1/3 -- fxo-ls up down idle on-hook y
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