Configuration example for one-to-one binding between FXS and FXO

• Router A and Router B are connected over an IP network and a PSTN. Telephone A attached to Router A can make calls to Telephone B attached to Router B over the IP network or the PSTN.

• Usually, Telephone A makes calls to Telephone B over the IP network. In the case that the IP network is unavailable, Router A sends call from Telephone A through the bound FXO interface to Telephone B over PSTN.

• Configure one-to-one binding between FXS and FXO voice subscriber lines.

• When the IP network is available, the VoIP entity is preferably used to make calls over the IP network.

• When the IP network is unavailable, the POTS entity is used to make calls through the bound FXO voice subscriber line over the PSTN.

Routing-related configurations are beyond the scope of this example. This example assumes that Router A and Router B are reachable to each other.

1. Configure Router A:

   <RouterA> system-view
   [RouterA] voice-setup
   [RouterA-voice] dial-program
   

   # Configure a VoIP entity for IP calls and set the match template to 210….

   [RouterA-voice-dial] entity 210 voip
   [RouterA-voice-dial-entity210] match-template 210....
   [RouterA-voice-dial-entity210] address sip ip 192.168.0.76
   [RouterA-voice-dial-entity210] quit
   

   # Configure a POTS entity for the FXS voice subscriber line.

   [RouterA-voice-dial] entity 0101001 pots
   [RouterA-voice-dial-entity101001] match-template 0101001
   [RouterA-voice-dial-entity101001] line 6/24
   [RouterA-voice-dial-entity101001] quit
   

   # Configure a backup POTS entity on the FXO voice subscriber line, set the match template to .T, enable the sending of all digits of a called number, and configure a calling number permitted to originate calls to the POTS entity.

   [RouterA-voice-dial] entity 211 pots
   [RouterA-voice-dial-entity211] match-template .T
   [RouterA-voice-dial-entity211] line 6/0
   [RouterA-voice-dial-entity211] send-number all
   [RouterA-voice-dial-entity211] caller-permit 0101001
   [RouterA-voice-dial-entity211] quit
   [RouterA-voice-dial] quit
   [RouterA-voice] quit
   

   # Configure the PLAR function and the delay off-hook binding.

   [RouterA] subscriber-line 6/0
   [RouterA-subscriber-line6/0] private-line 0101001
   [RouterA-subscriber-line6/0] hookoff-mode delay bind 6/24
   [RouterA-subscriber-line6/0] quit
   

   # Configure a dial plan where the VoIP entity is preferred.

   [RouterA] voice-setup
   [RouterA-voice] dial-program
   [RouterA-voice-dial] select-rule type-first 2 1 3 4
   

2. Configure Router B:

   <RouterB> system-view
   [RouterB] voice-setup
   [RouterB-voice] dial-program
   

   # Configure a VoIP entity for IP calls and set the match template to 010….

   [RouterB-voice-dial] entity 010 voip
   [RouterB-voice-dial-entity10] match-template 010....
   [RouterB-voice-dial-entity10] address sip ip 192.168.0.71
   [RouterB-voice-dial-entity10] quit
   

   # Configure a POTS entity on the FXS voice subscriber line.

   [[RouterB-voice-dial] entity 2101002 pots
   [RouterB-voice-dial-entity2101002] match-template 2101002
   [RouterB-voice-dial-entity2101002] line 6/24
   [RouterB-voice-dial-entity2101002] quit
   

   # Configure a backup POTS entity on the FXO voice subscriber line, set the match template to .T, enable the sending of all digits of a called number, and configure a calling number permitted to originate calls to the POTS entity.

   [RouterB-voice-dial] entity 011 pots
   [RouterB-voice-dial-entity11] match-template .T
   [RouterB-voice-dial-entity11] line 6/0
   [RouterB-voice-dial-entity11] send-number all
   [RouterB-voice-dial-entity11] caller-permit 2101002
   [RouterB-voice-dial-entity11] quit
   [RouterB-voice-dial] quit
   [RouterB-voice] quit
   

   # Configure the PLAR function and the delay off-hook binding.

   [RouterB] subscriber-line 6/0
   [RouterB-line6/0] private-line 2101002
   [RouterB-line6/0] hookoff-mode delay bind 6/24
   [RouterB-line6/0] quit
   

   # Configure a dial plan where the VoIP entity is preferred.

   [RouterB] voice-setup
   [RouterB-voice] dial-program
   [RouterB-voice-dial] select-rule type-first 2 1 3 4
   

3. In the case that the IP network is unavailable, configure Router A and Router B as follows:

   # Configure Router A, with the POTS entity preferred and the other configurations remaining unchanged.

   <RouterA> system-view
   [RouterA] voice-setup
   [RouterA-voice] dial-program
   [RouterA-voice-dial] select-rule type-first 1 2 3 4
   

   # Configure Router B, with the POTS preferred and the other configurations remaining unchanged.

   <RouterB> system-view
   [RouterB] voice-setup
   [RouterB-voice] dial-program
   [RouterB-voice-dial] select-rule type-first 1 2 3 4