Verifying the H.323 Configuration

To verify the H.323 configuration, perform this task.

Verifying H.323 Counters

Purpose

Display information about active calls.

Action

From the J-Web interface, select Monitor > ALGs > H323. Alternatively, from the CLI, enter the show security alg sip calls command.

H.323 counters summary:
  Packets received         : 0
  Packets dropped          : 0
  RAS message received     : 0
  Q.931 message received   : 0
  H.245 message received   : 0
  Number of calls          : 0
  Number of active calls   : 0
H.323 error counters:
  Decoding errors          : 0
  Message flood dropped    : 0
  NAT errors               : 0
  Resource manager errors  : 0
H.323 message counters:
  RRQ       : 0
  RCF       : 0
  ARQ       : 0
  ACF       : 0
  URQ       : 0
  UCF       : 0
  DRQ       : 0
  DCF       : 0
  Oth RAS   : 0
  Setup     : 0
  Alert     : 0
  Connect   : 0
  CallProd  : 0
  Info      : 0
  RelCmpl   : 0
  Facility  : 0
  Empty     : 0
  OLC       : 0
  OLC-ACK   : 0
  Oth H245  : 0

What it Means

The output provides counts at the packet, message, and call levels. Verify the following information:

• Number of packets received and dropped
• Number of remote access service (RAS), Q.931, and H.245 messages received
• Number of calls and active calls
• Number of all types of H.323 messages

Note that H.323 counters for calls and active calls in the output to this show security command do not apply to the proprietary Avaya implementation of H.323. This is because Q.931 setup and connect messages are exchanged right after the phone is powered up and call creation and tear down is done by Facility messages.

Note also that counters for calls and active calls are increased when the resources allocated for calls are increased—that is, messages belonging to the same call and that pass the firewall multiple times increment the counters. This applies when resources for a call need to be allocated multiple times. For example, in a two-zone scenario the setup and connect message pair allocates one call resource, and the active call counter is increased by one. But in a three-zone scenario the setup and connect message pair passes the firewall twice, each time allocating different call resources. In this case, the counter is incremented.

Counters for H.245 messages received also will not be accurate in the case of H.245 tunneling. Because H.245 messages are encapsulated in Q.931 packets, the counter for H.245 messages received will remain zero even when there are H.245 messages. The Other H245 counter will, however, reflect these packet transmissions.

Related Topics

• Understanding the H.323 ALG