3Com MSR 50 Series Configuration Manual page 2281

Dialing the number 0755-2003 on phone 0755-2001 connects to Router B. Since
Router B works in the private-line mode, it requests connection to the preset
remote number 010-1001 at Router A side.
Network diagram
Figure 661 Network diagram for FXO
Router A
1.1.1.1/24
010-1001
Configuration procedure
1 Configure Router A
<RouterA> system-view
[RouterA] voice-setup
[RouterA-voice] dial-program
[RouterA-voice-dial] entity 0755 voip
[RouterA-voice-dial-entity755] match-template 0755....
[RouterA-voice-dial-entity755] address ip 2.2.2.2
[RouterA-voice-dial-entity755] quit
[RouterA-voice-dial] entity 1001 pots
[RouterA-voice-dial-entity1001] match-template 0101001
[RouterA-voice-dial-entity1001] line 1/0
2 Configure Router B
<RouterB> system-view
[RouterB] voice-setup
[RouterB-voice] dial-program
[RouterB-voice-dial] entity 010 voip
[RouterB-voice-dial-entity10] match-template 010....
[RouterB-voice-dial-entity10] address ip 1.1.1.1
[RouterB-voice-dial-entity10] quit
[RouterB-voice-dial] entity 2001 pots
[RouterB-voice-dial-entity2001] match-template 07552001
[RouterB-voice-dial-entity2001] line 1/0
[RouterB-voice-dial-entity2001] send-number all
# Configure FXO interface line1/0.
[RouterB-voice-dial-entity2001] quit
[RouterB-voice-dial] quit
[RouterB-voice] subscriber-line 1/0
[RouterB-voice-dial-line 1/0] private-line 0101001
WAN
Router B
2.2.2.2/24
VoIP Configuration Example
FXO line 1/0
0755-2003
0755- 2001
2281
PBX