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Administrator’s Guide for Polycom HDX Systems
C - 4
Q.850 Cause Codes
The following table describes codes that the ISDN switch sends to the Polycom
HDX system to indicate call status. Although the codes are standardized, each
ISDN service provider defines them differently. Because of this, the definitions
in the table may not exactly match the messages that you see.
621 Invalid Address The address you entered is not valid. Check the
calling information and try again.
626 Invalid Address The address you entered is not valid. Check the
calling information and try again.
627 Invalid Address The address you entered is not valid. Check the
calling information and try again.
648 No Network
Resources
The network does not have the necessary
resources to complete your call. Try the call again
later.
681 No Network
Resources
The network does not have the necessary
resources to complete your call. Try the call again
later.
Code Cause Description
Code Cause Definition
1 Unassigned number The switch received the sent ISDN number in the
correct format, but no destination equipment uses
the number.
2 No route to specified
transit network
The ISDN exchange does not recognize the
intermediate network through which to route the
call.
3 No route to
destination
The intermediate network through which the call is
routed does not serve the destination address.
6 Channel
unacceptable
The specified channel does not provide adequate
service quality to accept the requested
connection.
7 Call awarded and
delivered
The user is assigned an incoming call that is being
connected to a call channel that has already been
established for this user and this type of call.
16 Normal call clearing The originator or receiver of the call has requested
that it be cleared.
17 User busy All B channels are in use; the called system
acknowledges the connection request, but is
unable to accept the call.