Dial Peers

Call legs define the voice route patch

Call legs matched inbound and outbound

Types of dial peers:

• POTS - Traditional telephony connections (port)
• VoIP - packet-based network connections (IP Address)
• VoATM - ATM network connections (VPI/VCI)
• VoFR - Frame Relay connections (DLCI)

ATM / Frame Relay networks can use VoIP if using IP Addresses

Wildcards and Voice Route Matching

POTS dial peers strip any explicitly defined number, access code defined for outside line

9………. will automatically strip the 9

.T requires at least one digit

PLAR - Private-line automatic ringdown - create a call without dialing

OPX - outside premise Extension PLAR - rings phone but maintains control of the call

Outbound Dial Peer Selection

1. Closest match
2. Explicit Preference (0-10, 0 is default, lower numbers are more preferred)
3. Random (preference is tied)

Inbound Dial Peer Selection

1. Incoming Called-Number (DNIS) - not on FXO ports
2. Answer-Address (ANI) - caller ID, route by callers region
3. Destination-Pattern (ANI)
4. Port Assignment (POTS Only)
5. Dial-peer 0

Dial Peer 0

• Works for any CODEC
• has VAD enabled
• Marks traffic as IP Precedence 0 - no QoS
• has no RSVP support
• supports Fax-Rate service
• disabled by default on UC520, enabled by default on routers
• can’t be configured

Dial Peer Hunt

Can change selection, 0 is the default

dial-peer hunt

Preference - VoIP for long distances and FXO for failover

Huntstop - stop once lines are all in use

Digit Manipulation

• Forward-digits - how many right-most digits to send (POTS only)
• Prefix - add digits
• Num-Exp - globally change numbers
  • Redirect emergency calls to an extension
  • Translation DDI to extensions

num-exp 911 112

num-exp 60255521.. 21..

• Translation-Rule - advanced digit manipulation

Configuring POTS dial peers

FXS Ports

dial-peer voice 101 pots
  destination-pattern 101
  port 1/0/1

FXO Ports

dial-peer voice 10 pots
  description 10-DIGIT LOCAL DIALING
  destination-pattern 9[^1].........
  port 1/0/3
	
dial-peer voice 11 pots
  description LONG DISTANCE DIALING
  destination-pattern 91..........
  forward-digits 11
  port 1/0/3
	
dial-peer voice 12 pots
  description INTERNATIONAL DIALING
  destination-pattern 9011T
  port 1/0/3
	
dial-peer voice 911 pots
  destination-pattern 911
  forward-digits all
  port 1/0/3
dial-peer voice 9911 pots
  destination-pattern 9911
  forward-digits 3
  port 1/0/3

!!PLAR is uses to direct incoming calls to an extension
 voice-port 1/0/3
    connection plar 101

Using POTS as a backup for dialing extensions over a WAN connection

dial-peer voice 2101 pots 
  description BACKUP DDI
  destination-pattern 21..
  preference 1
  no digit-strip
  prefix 602555
  port 1/0/3

Configuring VOIP dial peers

dial-peer voice 102 voip
  destination-pattern 102
  session target ipv4:10.1.1.2

Dial Peer verification commands

show dial-peer voice summary

debug voip dialpeer

csim start 101

show voice call summary

show voice call status