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Cisco VG202, Cisco VG202XM, Cisco VG204, and Cisco VG204XM Voice Gateways Software Configuration Guide
OL-16191-01
Chapter 4 Configuring Voice
Configuring the MAC Address Convention
Configuring the MAC Address Convention
The voice gateways use the MAC address of the SCC local interface to define unique MAC addresses
for each voice port by using the last 9 digits of the SCCP local interface of the voice gateway.
For example, if the source interface MAC address is 000C.8639.5833, the MAC address of the voice port
MAC address will be C863.9583.3XXX. In the preceding example, the last 9 digits of the SCCP of the
local voice gateway become the first 9 digits of the voice port MAC address after dropping the leading
000.
The last 3 digits of the voice port MAC address is the slot number (3-bit) + subunit number (2-bit) + port
number (7-bit) in hexadecimal format. You combine the digits to get the last three MAC address digits.
For example, the voice-port 0/0 is slot number 0 (000): subunit 0 (00) and port number 0 (0000000). By
stringing the digits together, you get the following: 0000 0000 0000 = 0 0 0. This means that if the source
interface MAC address is 001f.cac3.b3f8, the MAC address of voice port 0/0 will be 1FCAC3b3f8000.
Table 4-1 shows the voice port to MAC address conversion table.
Step 20
dial-peer voice tag pots
Example:
VG(config)# dial-peer voice 999000 pots
Defines a particular dial peer, to specify the method of
voice encapsulation, and to enter dial-peer configuration
mode. Tag defines a particular dial peer. The tag range is
from 1 to 2147483647. The POTS peer uses VoIP
encapsulation on the IP backbone.
Step 21
service stcapp
Example:
VG(config)# service stcapp
Enables STC application feature service.
Step 22
port port-number
Example:
VG(config)# port 0/0
VG(config)# port 0/1
VG(config)# port 0/2
Configures the port number.
Step 23
exit
Example:
VG(config)# exit
Exits to global configuration mode.
Command or Action Purpose
Table 4-1 Voice Port to MAC Address Conversion Chart
Port Number
Last Three Digits of the MAC
Address
0/0 000
0/1 001
0/2 002
0/3 003