Configuration and Settings Cisco VoIP Tie Line

This article explains how to configure VoIP on Cisco router and composed of the following sections related to VOIP. I have shown following scenarios, configuration, diagrams (and Visio stencile) to make you understand and adapt it to your work.

The Cisco + PBX diagram illustrates the topology of this connection example.

Below are some of the VoIP traffic scenario;
     1. HQ Office -> any IP Telephony site: Since we are on VoIP, traffic will route to available link. In case there will be an outage on Verizon MPLS all traffic including voice will be routed to Brach Office VPN. This might impact a lot on the voice quality because Internet Link will not guaranteed or priority on VPN.

     2. Branch Office -> HQ Office site VoIP call: In case of link outage between two offices. Voice traffic will reroute to VPN -> MPLS before it reaches the HQ Office PBX. Again no guarantee on voice quality because of the path that it will take.

     3. Branch Office -> IP Telephony via HQ Office PBX routing: Outages on either E1 link between two office or Verizon MPLS will “Greatly” impact the quality of voice. Meaning if Branch Office call IP Telephony voice traffic will go to HQ Office, then HQ Office will route call to Branch Office again since MPLS is down, then route to VPN.

The following example shows  the configuration VoIP for Tie Line connection between 2 site with PABx  

hostname BRCM1-3845	hostname HQRV1-7206VXR
isdn switch-type primary-qsig voice-card 1 no dspfarm ! controller E1 1/1 pri-group timeslots 1-17 description --- QSIG Trunk to Nortel PBX ---	card type e1 2 ! isdn switch-type primary-net5 voice-card 0 no dspfarm ! controller E1 0/2/0 pri-group timeslots 1-17 description --- Inbound E1 interface --- ! controller E1 0/2/1 pri-group timeslots 1-17 description --- Outbound E1 interface --- ! controller E1 2/0 pri-group timeslots 1-31 description ISDN/PRI E1 - TelecomAsia vlan internal allocation policy ascending
interface Loopback0 description Loopback for BRCM1-3845 ip address 176.40.203.248 255.255.255.255 no ip redirects no ip unreachables no ip proxy-arp no ip mroute-cache	interface Loopback0 description Hostname:HQRV1-7206VXR ip address 176.40.203.222 255.255.255.255 no ip redirects no ip proxy-arp ip route-cache flow no ip route-cache cef no ip mroute-cache h323-gateway voip interface h323-gateway voip id SGDCGK1 ipaddr 176.44.1.252 1719 h323-gateway voip h323-id HQRV1-7206VXR h323-gateway voip tech-prefix 1# h323-gateway voip bind srcaddr 176.40.203.222
interface FastEthernet0/0 description Connected to LAN no ip address no ip redirects no ip unreachables no ip proxy-arp ip nbar protocol-discovery ip pim sparse-dense-mode no ip route-cache cef no ip route-cache no ip mroute-cache speed 100 full-duplex	interface FastEthernet0/0 description *** OFFICE ETHERNET SEGMENT, THAILAND*** ip address 176.40.200.210 255.255.255.252 no ip proxy-arp ip pim sparse-dense-mode no ip route-cache no ip mroute-cache ip policy route-map Offshore duplex full no mop enabled
interface Serial1/1:15 no ip address encapsulation hdlc isdn switch-type primary-qsig isdn incoming-voice voice no cdp enable	interface Serial0/2/0:15 no ip address encapsulation hdlc isdn switch-type primary-net5 isdn protocol-emulate network isdn incoming-voice voice no cdp enable ! interface Serial0/2/1:15 no ip address encapsulation hdlc isdn switch-type primary-net5 isdn incoming-voice voice no cdp enable
voice-port 1/1:15 cptone TH	voice-port 0/2/0:15 ! voice-port 0/2/1:15
dial-peer cor custom ! dial-peer voice 1000 pots destination-pattern 8596[2-5]... progress_ind setup enable 3 progress_ind alert enable 8 direct-inward-dial port 1/1:15 forward-digits 7 ! dial-peer voice 10001 voip destination-pattern 8T session target ipv4:176.40.203.230 dtmf-relay h245-alphanumeric ip qos dscp ef signaling no vad	dial-peer voice 1000 pots description --- IPT Inbound to Loop --- preference 1 destination-pattern 8[2-9]...... progress_ind setup enable 3 progress_ind alert enable 8 direct-inward-dial port 0/2/0:15 forward-digits 7 ! dial-peer voice 2000 pots description --- IPT Outbound from Loop --- preference 2 incoming called-number . direct-inward-dial port 0/2/1:15 ! dial-peer voice 5127 voip description --- IPT Peer to HQ via HQRV1 --- huntstop preference 3 destination-pattern 512[6-7]... session target ipv4:176.40.203.222 dtmf-relay h245-alphanumeric ip qos dscp ef signaling no vad ! gateway timer receive-rtp 1200

To download the Visio Stencils, sample full configuration go here icons, configuration