CME router can be connected to many numbers of analog and digital connections.But this router will not know how to use it unless you define or create dial-peers for those connections.
Dial peers are the entity that defines voice reachability information.Dial peers established logical connections, called call legs, to complete the end-to-end call.
Dial peers are the entity that defines voice reachability information.Dial peers established logical connections, called call legs, to complete the end-to-end call.
Dial peers are generally classified into two categories.
POTS dial Peers: Provides connection or voice reachability information for traditional telephony networks like PSTN, PBX, analog telephones.It also includes devices connected to the FXO, FXS and E&M.
POTS dial-peer includes devices those doesn't have an IP address like analog phones, Fax, PBX, PSTN.
VoIP dial Peers: Provides voice reachability information of VoIP networks. Points to the IP address or DNS name of the destination VoIP device that terminates the call.VoIP dial peers map a dial string to a remote network device.The remote devices are CUCM, CME, SIP proxy, H.323 gateway, any voice gateway.
Configuring POTS dial Peers
Figure 1.1 blow shows network for dial-peers configuration. The configuration of POTS dial-peers begins with the CME A.Two analogs phones are connected to the CME A route via FXS ports.
In POTS dial-peer voice port automatically strips explicitly defined dial numbers.To prevent this in the router no digit-strip command is used.The forward-digits all command is used on a router to forward all defined digits.
As shown in example 1-3 above, in VoIP dial-peer, compared to POTS session-target is used instead of tag.This command is often used with the syntax session-target ipv4:ip_address, where IP is of remote entities like CUCM, CME, Gateways etc.
The codec value is set by using codec command.The default codec value for VoIP dial-peer is G.729.
Mismatch in codec value between two routers results in call failure and returns fast busy signal.
VoIP dial-peer does not strip explicitly defines numbers.So no need to define no digit-strip or forward-digits all command.
In the next blog you find more about dial peer wild card and dial patterns.
POTS dial Peers: Provides connection or voice reachability information for traditional telephony networks like PSTN, PBX, analog telephones.It also includes devices connected to the FXO, FXS and E&M.
POTS dial-peer includes devices those doesn't have an IP address like analog phones, Fax, PBX, PSTN.
VoIP dial Peers: Provides voice reachability information of VoIP networks. Points to the IP address or DNS name of the destination VoIP device that terminates the call.VoIP dial peers map a dial string to a remote network device.The remote devices are CUCM, CME, SIP proxy, H.323 gateway, any voice gateway.
Configuring POTS dial Peers
Figure 1.1 blow shows network for dial-peers configuration. The configuration of POTS dial-peers begins with the CME A.Two analogs phones are connected to the CME A route via FXS ports.
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| Figure 1.1: Dial-peer Configuration Network |
There are main two parameters in POST dial-peer which are needed to be specified.They are the telephone number and voice port.
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| Example 1-1: POTS dial-peer Configuration |
As shown in the example 1-1 to create dial-peer you need to enter into global configuration mode of the router CME A. In global configuration mode use command dial-peer voice tag pots.Where the tag is any number you want to give. It is not necessary to have the same tag number and destination-pattern number.
The destination-pattern is used for matching of called telephone number. In this example, we have number "1101".
The port command specifies the respective voice port. In this example, port 0/0/0 defines that the port is on module 0(1st), voice interface card (VIC) slot 0 (2nd), and voice port 0.
In POTS dial-peer voice port automatically strips explicitly defined dial numbers.To prevent this in the router no digit-strip command is used.The forward-digits all command is used on a router to forward all defined digits.
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Configuring VoIP dial peer
As shown in figure CME A and ROUTER B are connected via IP WAN.TO make calls for this type of connectivity you must use VoIP dial-peers because the call is crossing an IP connectivity of the network. |
| Example 1-3: VoIP dial-peer Configuration |
As shown in example 1-3 above, in VoIP dial-peer, compared to POTS session-target is used instead of tag.This command is often used with the syntax session-target ipv4:ip_address, where IP is of remote entities like CUCM, CME, Gateways etc.
The codec value is set by using codec command.The default codec value for VoIP dial-peer is G.729.
Mismatch in codec value between two routers results in call failure and returns fast busy signal.
VoIP dial-peer does not strip explicitly defines numbers.So no need to define no digit-strip or forward-digits all command.
In the next blog you find more about dial peer wild card and dial patterns.
