Refer to the exhibit. You have received a trouble ticket stating that calls to international numbers
are failing. To place an international call, users dial the access code “9,” followed by “011,” the
country code, and the destination number. After entering the debug isdn q931 command on the
MGCP gateway, you have the user attempt the call again.
Based on the debug output, what is the most likely cause of this problem?
A.
Cisco Unified CallManager is not stripping the access code before sending the call to the
gateway.
B.
The gateway dial peer needs to prefix “011” to the called number so the PSTN knows this is an
international call.
C.
The user’s CSS does not permit international calls.
D.
The TON is incorrect.
E.
The circuit is not configured correctly or has a physical layer issue.
Explanation:
Cause Code Origination Point
Look @ message Chanel ID i = 0x828381
The first byte (most significant) after 0x indicates the point in the circuit path where the disconnect
cause code appears.
The last two hexadecimal digits (BEin the example) are optional. You do not commonly use these
digits for diagnostic purposes. However, you can sometimes use this byte to furnish additional
information for the Disconnect Cause Code. Thedebug isdn q931 output can sometimes contain
these digits.
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