Verifying the VoIP Configuration

To verify the VoIP configuration, perform the following tasks:

Purpose

Verify that the VoIP interface is correctly configured.

Action

From the CLI, enter the show interfaces extensive command.

Physical interface: vp-3/0/0, Enabled, Physical link is Up
  Interface index: 141, SNMP ifIndex: 21, Generation: 142
  Type: VP-AV, Link-level type: VP-AV, MTU: 1518, Speed: 10mbps
  Device flags   : Present Running
  Link type      : Full-Duplex
  Link flags     : None
  Physical info  : Unspecified
  CoS queues     : 8 supported, 8 maximum usable queues
  Last flapped   : 2006-09-29 09:28:32 UTC (4d 18:35 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :              8886912                    0 bps
   Output bytes  :              6624354                    0 bps
   Input  packets:                90760                    0 pps
   Output packets:                65099                    0 pps
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Giants: 0, Policed discards: 0, 
Resource errors: 0
  Output errors:
    Carrier transitions: 0, Errors: 0, Drops: 0, MTU errors: 0, Resource errors: 0
  Egress queues: 8 supported, 8 in use
  Queue counters:       Queued packets  Transmitted packets      Dropped packets
    0 best-effort                65099                65099                    0
    1 expedited-fo                   0                    0                    0
    2 assured-forw                   0                    0                    0
    3 network-cont                   0                    0                    0
  Packet Forwarding Engine configuration:
    Destination slot: 2
    CoS transmit queue               Bandwidth               Buffer Priority   Limit
                              %            bps     %           usec
    0 best-effort            95        9500000    95              0      low    none
    3 network-control         5         500000     5              0      low    none
                    
  Logical interface vp-3/0/0.0 (Index 71) (SNMP ifIndex 47) (Generation 137)
    Flags: Point-To-Point SNMP-Traps Encapsulation: VP-AV
    Protocol inet, MTU: 1500, Generation: 142, Route table: 0
      Flags: None   
      Filters: Input: pcap, Output: pcap
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.10.10.2, Local: 10.10.10.1, Broadcast: Unspecified, 
Generation: 144

What it Means

The output shows a summary of interface information. Verify the following information:

• The physical interface is Enabled. If the interface is shown as Disabled, do either of the following:
  • In the CLI configuration editor, delete the disable statement at the [edit interfaces interface-name] level of the configuration hierarchy.
  • In the J-Web configuration editor, clear the Disable check box on the Interfaces>interface-name page.
• The physical link is Up. A link state of Down indicates that the interface is disabled. Do either of the following:
  • In the CLI configuration editor, delete the disable statement at the [edit interfaces interface-name] level of the configuration hierarchy.
  • In the J-Web configuration editor, clear the Disable check box on the Interfaces>interface-name page.
• The Last Flapped time is an expected value. The Last Flapped time indicates the last time the physical interface became unavailable and then available again. Unexpected flapping indicates likely link-layer errors.
• The traffic statistics reflect expected input and output rates. Verify that the number of inbound and outbound bytes and packets matches expected throughput for the physical interface. To clear the statistics and see only new changes, use the clear interfaces statistics interface-name command.

Purpose

Verify that the Media Gateway Controller (MGC) list is correctly configured and that the MGCs are reachable over the network.

Action

From the operational mode in the CLI, enter show tgm fpc slot-number media-gateway-controller.

Media gateway controller(s): 173.26.232.77
                             10.10.10.30
                             10.10.10.40

What it Means

The output shows the configured MGC list. Verify the following:

• The IP addresses and the order of the IP addresses in the MGC list are correct. The first MGC on the list is the primary MGC. The TGM550 searches for the primary MGC first. If it cannot connect to the primary MGC or loses its connection to the primary MGC, it attempts to connect to the next MGC in the list, and so on.
• Use the JUNOS CLI ping command or the J-Web ping host tool (Diagnose>Ping Host) to verify that the configured MGCs can be reached over the network.

Purpose

Verify that the dynamic call admission control (CAC) configuration supports sufficient bandwidth for VoIP traffic.

Action

From the operational mode in the CLI, enter show tgm dynamic-call-admission-control.

Reported bearer bandwidth limit: 3000  Kbps
Interface       State         Activation    Bearer bandwidth
                              priority      limit (Kbps)
ge-0/0/3.0      up                     200                 3000
t1-6/0/0.0      up                     150                 1000
br-1/0/3.0      up                      50                  128

What it Means

The output shows the dynamic CAC configuration. Verify the following information:

• The activation priority and bearer bandwidth limit (BBL) configured on individual interfaces are correct.
• The Reported bearer bandwidth limit field displays the bandwidth available for VoIP traffic. Ensure that the bandwidth is sufficient for VoIP traffic.