Cisco VOIP Basics – Call Broadcast for Cisco CME

Tony Mattke
Fundamentals
April 23, 2010
6 min read

This is the fourth and final part of my Cisco voip basics series. ( Parts 1, 2 & 3 ) Our goal in this series has been setting up a working voice gateway that you could use in your home office. In this post were going to cover a very specific issue. How do you ring yours FXS line(s) and your ephone-dns’s?

You can’t

As it turns out, in CME, you can’t do it. I’ve looked everywhere I can think of for an answer to this and have found that CME is lacking in features. At least on the platform that I’ve been using for this tutorial. Here is what I’ve tried.

Configure FXS as SCCP controlled port using STCAPP. This is not supported on my 1760-V for some reason, it appears to be supported on the newer ISRs.
Configure a hunt-group in broadcast mode between the FXS and ephone-dn. I have no clue how to do this, and can’t find any docs that show examples. (All the hunt groups I see are between ephones.. not FXS ports, or even mixed between them)
What I originally tried was just setting the same number/destination-prefix on both, this didn’t work at all. Probably obvious for anyone that does this stuff day to day..

TCL to the rescue

No, I didn’t give up. I actually found a very helpful member of the Cisco Support Community that gave me a copy of a script he had written to support exactly this. You’ll want to download a copy of the script and tftp it over to your router.

Setting the script up is done in a few stages, first we need to define the application, and the parameters we pass to it. We’re going to use 50 for my ephone-dn and 55 for the FXS port.

text

CME#conf t
CME(config)#application
CME(config-app)#service bcast flash:/bcast.tcl
CME(config-app-param) param destinations 50,55

The next thing we need to do is define the dial-peer that uses the broadcast service from the script. Here, were going to use dial-peer 100 to do just that. We also need to point this towards our FXO port connected to our external phone line.

text

CME(config)#dial-peer voice 100 pots
CME(config-dial-peer)#description broadcast hunt-group
CME(config-dial-peer)#service bcast
CME(config-dial-peer)#port 0/1

Thats it! Our bcast TCL script has been configured, and our router is ready to use it. But of course, we’re not quite done yet.

Other issues…

One thing you’ll also need to configure is Private-line automatic ringdown or PLAR. PLAR normally ensures that when a device is taken off-hook, it applies a ringing voltage to the circuit. This is where we get into the realm of things I really don’t understand, or care to research in VOIP. All I know is that setting up connection plar on my FXO port allowed my other phones to stop ringing when I answered.. The full config for my FXO looks something like this.

text

voice-port 0/1
 trunk-group OUT
 supervisory disconnect dualtone mid-call
 supervisory answer dualtone
 timeouts call-disconnect 1
 timeouts wait-release 1
 connection plar opx 5555555555
 description Vonage (home)
!

Another issue with my configuration is that my FXO cards do not support Caller ID, this is the main reason that I have discontinued using my CME server until I feel the need to purchase a new FXO card. In order to support caller id, you’ll need to purchase one of the following cards VIC-2FXO-M1, VIC-2FXO-M2, or the VIC-4FXO-M1.

Final Config.

This is more or less the configuration that I’ve ended up with after my adventure to understand more about Cisco VOIP and setup a working phone system for my home office.

text

!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname CME
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
clock timezone EST -5
clock summer-time EDT recurring
voice-card 0
!
voice-card 1
!
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 10.1.8.0 10.1.8.100
!
ip dhcp pool VOIP
   network 10.1.8.0 255.255.255.0
   domain-name mattke.net
   option 150 ip 10.1.8.1
   lease 7
!
!
no ip domain lookup
ip domain name mattke.net
ip name-server 192.168.8.8
ip name-server 4.2.2.2
multilink bundle-name authenticated
!
!
trunk group  OUT
!
voice register dn  1
!
application
  service bcast flash:/bcast.tcl
  param destinations 50,55
  !
!
archive
 log config
  hidekeys
!
!
ip ssh version 1
!
!
!
!
interface FastEthernet0/0
 ip address 192.168.8.9 255.255.255.0
 speed auto
!
interface FastEthernet0/0.2
 encapsulation dot1Q 2
 ip address 10.1.8.1 255.255.255.0
!
ip default-gateway 192.168.8.1
ip forward-protocol nd
!
ip http server
no ip http secure-server
ip http path flash:gui
!
tftp-server flash:/phone/7940-7960/P00308010100.bin alias P00308010100.bin
tftp-server flash:/phone/7940-7960/P00308010100.sb2 alias P00308010100.sb2
tftp-server flash:/phone/7940-7960/P00308010100.sbn alias P00308010100.sbn
tftp-server flash:/phone/7940-7960/P00308010100.loads alias P00308010100.loads
!
control-plane
!
!
!
voice-port 0/0
 supervisory disconnect dualtone mid-call
 supervisory answer dualtone
 timeouts call-disconnect 1
 timeouts wait-release 1
 connection plar 88
 description Office
!
voice-port 0/1
 trunk-group OUT
 supervisory disconnect dualtone mid-call
 supervisory answer dualtone
 timeouts call-disconnect 1
 timeouts wait-release 1
 connection plar opx 5555555555
 description Vonage (home)
!
voice-port 1/0
 description Home Phone
 station-id name HomePhone - 55
 caller-id enable
!
voice-port 1/1
 description not used
 caller-id enable
!
!
!
sccp local FastEthernet0/0
sccp
!
!
!
dial-peer voice 55 pots
 preference 1
 destination-pattern 55$
 port 1/0
!
dial-peer voice 1001 pots
 trunkgroup OUT
 description Long Distance
 destination-pattern 1?[2-9]..[2-9]......
 forward-digits all
!
dial-peer voice 1002 pots
 trunkgroup OUT
 description Local Calls
 destination-pattern .T
 forward-digits 7
!
dial-peer voice 1003 pots
 description International
 destination-pattern 011T
 port 0/0
!
dial-peer voice 100 pots
 description broadcast hunt-group
 service bcast
 port 0/1
!
!
telephony-service
 load 7960-7940 P00308010100
 max-ephones 3
 max-dn 24
 ip source-address 10.1.8.1 port 2000
 calling-number initiator
 service dnis dir-lookup
 timeouts interdigit 2
 system message ............................
 cnf-file location flash:
 cnf-file perphone
 max-conferences 4 gain -6
 moh music-on-hold.au
 web admin system name admin secret 5 $1$bQT5$xxxxxxxxxxxxxxxxx
 dn-webedit
 time-webedit
 transfer-system full-consult
 directory entry 1 5555555555 name Jessi - Cell
 create cnf-files version-stamp 7960 Mar 02 2002 10:41:36
!
!
ephone-dn  1
 number 88
 label BGPGuru
 description Tony Mattke
 name Anthony R. Mattke
 call-forward noan 55 timeout 18
 hold-alert 30 originator
!
!
ephone-dn  2
 number 50
 label Home
 description mattke.net
 preference 1
!
!
ephone  1
 description Anthony R. Mattke
 mac-address 0017.94CF.1E45
 type 7960
 button  1:1 2:2
!
!
!
line con 0
line aux 0
line vty 0 4
 login local
line vty 5 15
 login local
!
ntp master 10
ntp server 131.107.1.10 prefer
end

Obviously, as always, if you have any questions please leave a comment below. I promise I’ll try my best to help you out, or at least point you in the right direction. I’m in no way a voice engineer, but I was at least able to make this work for my home office.