19.2.3.6. Troubleshooting Hints 
If you encounter problems with DMC please check first the activation
switches in Section 2.3.1,
“DMC Authorization”.
Another switch to be checked is the diagnosis switch 08 in CP2 branch of
AMO
DIAGS.DISPLAY-DIAGS:COMP=CP2;
Please remember that switch S08=ON means DMC is deactivated
in the whole system, so the switch should be usually set to OFF in order
to have DMC enabled.
Then please assure that DMC configured resources for the involved
boards are not equal 0 or too few (see Section 2.3.2,
“Maximum number of DMC connections on IP boards”).
Check also if resource manager is configured/involved.
Further you can check if the components are not part of different
domains and inter-domains DMC is allowed or not.
Supported features table should also be checked (see Section 2.2,
“Service Information”).
The DMC connections can be checked by activating DIAGS switch 09 in
CP2. DMC connection related information would be visible then in HISTA
under:
F4066 M8 N4058 NO ACT BPA CP ADVISORY ALARM CLASS:CENTRAL:023 FORMAT:49 DMC
The flow which grants a successful DMC is:
|
At B party:
|
STATE_NEW
|
=
|
init;
|
event = ACT_PROXY_DMC_START
|
|
At A party:
|
STATE_NEW
|
=
|
active;
|
event = UP DMC_IND OK
|
|
At B party:
|
STATE_NEW
|
=
|
active;
|
event = UP DMC_CONF
|
WBM of IPDA/gateway boards could also be checked under Explorers'
Statistics, for some DMC related calls.
Useful may be display of AMO ZAUSL.The result shows counters of DMC
connections:
|N0059: NUM. OF ALL SUCCESS. DMC ATTEMPTS (ACT. OR PAS).. 0| |N0060: NUM. OF ALL UNSUCCES. DMC ATTEMPTS(ACT. OR PAS). 0| |N0061: NUM. OF SUCCESSFUL DMC ATTEMPTS, BOTH PROX. INTR. 0| |N0062: NUM. OF UNSUCCESSFUL DMC, BOTH PROXIES INTERNAL.. 0| |N0063: NUM. OF ALL UNSUCCES. DMC ATTEMPTS(INSTANT DMC). 0|
With G711, the CN RTP packages are displayed in wireshark as Payload
Type :Comfort Noise
With G729 they appears as: Payload Type :ITU-T G729 (no difference
to the normal RTP) but the length of payload is usually only 2 bytes
long and total package length is 60 bytes.
With G723.1 the CN is recognized in the field: frame size and codec
type:SID frame.