Mike's PBX Cookbook

Voice Gateway Channels

IP phones need access to the PBX TDM circuitry, they do this through a DSP on a Media Gateway card - a "Voice GateWay" channel.
An MC32 card, running IP Line software, is known as a VGMC. It has 32 DSP ports. Each shelf requires a VGMC, usually in slot 7.
Make sure there's a ZONE configured for VGMC's in LD 117 (PRT ZONE), the zone intent (ZBRN) is MO. Never use Zone 0!

Command Line:

Use LD 14 to configure the physical TN's for the Voice Gateway Media card (VGMC):

PromptResponseDescription
REQNEW, CHG, OUTCreate, change, delete Voice Gateway channels on a card
TYPEVGWVoice Gateway
TNl s c uThe physical TN: loop, shelf, card, unit
XTRKMC32MC32 - 32 port media card / MC32S - ITG PM 32 port card
ZONExA zone previously built in LD 117, with ZBRN: MO
CUSTxCustomer

First TN is unit 0, last TN is unit 31. You can build all 32 at once: NEW 32. VGW's can be STATed in LD 32.

In Element Manager:

  1. Click: IP Network ► Nodes: Servers, Media Cards
  2. Expand the NODE by clicking the plus sign (+) to the left of the node
  3. Click VGW Channels next to the card to be configured

    Element Manager: VGW Channels

  1. Click the Add button at the top of the VGW Channels window
  2. Fill in the fields as in LD 14, you can build 32 at once.

Element Manager: Add VGW's

  1. Click Submit, if successful a summary is displayed:

Element Manager: VGW's

VGW channels are special trunks, they do not require a route.

Voice Gateway Channel Status:

Check the card/channel status with stat in LD 32:

.stat 1 0 0
00 = UNIT 00 = IDLE            (TRK)(IPTN REG    )          ◄ IPTN Registered
01 = UNIT 01 = IDLE            (TRK)(IPTN REG    )
02 = UNIT 02 = IDLE            (TRK)(IPTN REG    )
03 = UNIT 03 = IDLE            (TRK)(IPTN REG    )
04 = UNIT 04 = IDLE            (TRK)(IPTN REG    )
05 = UNIT 05 = IDLE            (TRK)(IPTN REG    )
06 = UNIT 06 = IDLE            (TRK)(IPTN REG    )
:

Note: With G.723, every 4th channel is unregistered. This is normal.

You can also confirm the VGMC registration status with stat serv in LD 117:

=> stat serv

NODE  HOSTNAME          ELANIP          LDR   SRV     APPS    PBXLINK  PBXLINK     PBXLINK   CONNECTID
ID                                                            STATE    DATE        TIME
1015  pbxbook           10.10.10.15     YES   SS      LTPS    LINK UP  06/01/2096  08:46:21  200c3940
                                                      VTRK
      Sets: [reg - 00000] [busy - 00000]
      VTRK: [reg - 00000] [busy - 00000]
      SIGNALLING SERVER CAPACITY (SSRC): 2048

1015  VGW               10.10.10.51     NO    SMC     LTPS    LINK UP  06/01/2096  08:54:19  200c3840  ◄ VGMC
      Sets: [reg - 00000] [busy - 00000]
      VGWs: [reg - 00032] [busy - 00000]
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