So I’ve configured voice service a number of times, but never using Cisco equipment. There’s a business starting up here on Orcas Island and they need a number of lines voice and fax service. I had a spare 2801 router laying around and heard that it’s possible to provision voice service using these machines. So I looked on eBay for a module that will provide more than two FXS ports and decided on the VIC-4FXS. When it was delivered, I installed it and booted the router. It told me that it needed a PVDM DSP Module, so I got one of those as well. It has arrived. I have installed it. Now when I boot the router, I don’t get a warning or an error.
configure the router to send outbound calls to the SIP server
configure the router to send inbound calls to FXS ports 2,3,4 in round robin
trunk group FXSlines ! voice-port 0/2/1 trunk-group FXSlines ! voice-port 0/2/2 trunk-group FXSlines ! voice-port 0/2/3 trunk-group FXSlines
configure the router to send inbound calls to the correct ports on the VIC-4FXS
dial-peer voice 1 pots preference 7 destination-pattern 3602987792 translate-outgoing called 10 port 0/2/0 forward-digits all ! dial-peer voice 2 pots preference 2 destination-pattern 3602987793 translate-outgoing called 10 port 0/2/1 forward-digits all ! dial-peer voice 3 pots preference 3 destination-pattern 3602987794 translate-outgoing called 10 port 0/2/2 forward-digits all ! dial-peer voice 4 pots preference 4 destination-pattern 3602987795 translate-outgoing called 10 port 0/2/3 forward-digits all
configure the router to accept inbound calls from the asterisk call server
voice service voip allow-connections sip to sip no supplementary-service sip moved-temporarily no supplementary-service sip refer fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco sip registrar server expires max 3600 min 3600 localhost dns:8.8.8.8
configure the asterisk call server to send inbound calls to the router
On asterisk call server, edit sip.conf to register with SIP server on cisco router at 172.16.78.209:
[fhvoice] type=peer insecure=port,invite context=fhvoice disallow=all allow=ulaw language=en canreinvite=no host=172.16.78.209 qualify=20000 dtmfmode=rfc2833
On asterisk call server, edit extensions.conf and add extensions to the incoming context:
exten => 3602987792,1,Dial(SIP/fhvoice/${EXTEN},30)
same => n,Hangup()
exten => 3602987793,1,Dial(SIP/fhvoice/${EXTEN},30)
same => n,Hangup()
exten => 3602987794,1,Dial(SIP/fhvoice/${EXTEN},30)
same => n,Hangup()
exten => 3602987795,1,Dial(SIP/fhvoice/${EXTEN},30)
same => n,Hangup()
2 responses to “Configuring voice service on a Cisco 2801 Integrated Services Router via Asterisk”
Any experience with 2801 as FXO trunk?
Only enough to know that I don’t know enough about ios, unfortunately. I tried but didn’t have enough tuits and they were getting expensive. I have the hardware in case I want to give it another go, though!