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h323chan_chn_sm: Connect Failed on AS5350XM H323 Gateway

We have a problem of high abandon voip calls.

The system is using H323 protocol.

From one of the AS5350XM servers, we found high number of h245 failures compared to other AS5350XM.

A debug on h245 events showed:

Dec 27 18:18:29.575 AEST: Changing to new event: CONNECT

h323chan_chn_connect: connecting to 10.188.59.187:1720

Dec 27 18:18:29.575 AEST: h323chan_gw_conn: Created socket fd=-1

Dec 27 18:18:29.575 AEST: h323chan_gw_conn: socket failure: errno=5 errstr=I/O errorh323chan_chn_connect: h323chan_gw_conn failed, error 5

Dec 27 18:18:29.575 AEST: h323chan_chn_sm: Connect Failed

Dec 27 18:18:29.579 AEST: h323chan_chn_process_read_socket: fd=2 of type CONNECTED has data

Dec 27 18:18:29.615 AEST: h323chan_chn_process_read_socket: fd=2 of type CONNECTED has data

sh h323 gateway cause-codes showed this:

38 network out of order ( 41 438509

41 temporary failure (41) 2731 1576

42 switch congestion (42) 8 0

44 no requested circuit ( 38 0

47 no resource (47) 60 2068377

1 REPLY
Cisco Employee

Re: h323chan_chn_sm: Connect Failed on AS5350XM H323 Gateway

All the reason codes you are getting are related to congestion. I would start checking if you get the dropped calls only during peak hours and your channels are really busy.

You can also check this bug that affects IOS 12.3 CSCsb21047

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