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Inbound ISDN Calls Rejected by Intel Dialogic Board with Cause Code 34 or 44
In some cases, the Dialogic ISDN firmware may
respond to a SETUP message with cause code 34 (“No circuits available”) or
cause code 44 (“Requested channel not available”) when there are lines still
available.
Possible solutions:
1. Set
the bit in parameter 24 of the ISDN .PRM file to enable host controlled release.
This will cause the RELEASE (or RELEASE COMPLETE) message to be sent on
the D channel only when the application calls xx_releasecall().
You will need to stop and restart the Dialogic services after making this
change.
| 0024 | 00* 01 02 04 08 10 20 40 80 | Feature
flag:
|
2. Request
that the central office change the hunt strategy for the T-1
3. Check
that xx_dropcall() and xx_releasecall() are performed correctly by the
application in all cases: when the application hangs up, when the caller hangs
up, and when xx_makecall() fails due to glare.
4.
Verify that the channel really was ready to accept a call.
If a channel is reset or restarted (xx_resetlinedev() ), the default
behavior for that channel would be to NOT accept a call until the application
issues a xx_waitcall() API command on that channel.
If a call comes in on the D channel after the reset but before the
waitcall, then that call would be rejected by the firmware.
If in doubt, get a D-channel
trace and determine which inbound call was rejected and when the previous call
on that channel was released.
Further reading: ISDN Cause
codes
http://resource.intel.com/telecom/support/tnotes/tnbyos/winnt/tn459.htm
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