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Service Functions, Troubleshooting 65
ባ Check the curled cord of the receiver for defects.
Telephoning impossible
The most important requirement for telephoning is the presence of a dial
tone after picking up the receiver. If this is not the case, the previous
chapter will help you.
If an external call is not possible with your telephone, please check, if
this problem is also existing on other internal telephones or if dialling a
different external number is possible.
No external Call possible
ቢ If you have this problem only with some internal telephones, please
check the exchange line authorization for these subscribers (config-
uration program COMset).
ባ If you have this problem only with some internal telephones, please
check, if there is a call allowance configured for these subscribers
and if the account is empty (see p. 32).
ቤ If this problems happens after the first power-on, please check, if
your ISDN connection supports the necessary protocol (DSS1). Ask
your network provider!
ብ Please check the connection between the NT (NTBA or external S
0
bus) and the PBX.
ቦ Disconnect the PBX from the external power supply (Pull the plug)
for 5 seconds. If the problem is solved, the PBX or the telephone
had a malfunction.
ቧ You can check the function of the NT by directly connecting an
ISDN telephone (If you have a Point-to-point ISDN line, the tele-
phone must be compatible to the Point-to-point connection). If there
is still no telephoning possible, disconnect the NT from the external
power supply (Pull the plug) and the exchange line for 5 seconds.
If the problem is solved, the NT had a malfunction. If the problem
remains, contact your network provider for help.
Short-Code Dialling is not possible, external Calls are
possible
ቢ Eventually no number is stored under the dialled Short-Code
number or the Exchange Line Access Number was added as a pre-
fix (see p. 34).
Telephoning on the internal S
0
Port is not possible
ቢ If you hear the busy tone after picking up the receiver, eventually
both voice channels of the, internal S
0
ports are busy. Try again
later.
ባ If this problem exists for system telephones (COMfortel 1500/2500
and COMfort 1000/1200/2000 plus) and if „invalid MSN“ is shown in
the display when picking up the receiver, no or a wrong telephone
number has been configured as MSN in the telephone. Enter an
internal telephone number (from the range of numbers on the inter-
nal S
0
port) here.
ቤ Perhaps no or a wrong telephone number has been entered as the
1st MSN in the telephone. Enter an internal telephone number
(from the range of numbers on the internal S
0
port). Please note that
this MSN has to presented to the PBX by the telephone (see man-
ual of the telephone).
ብ Disconnect the telephone from the PBX for 5 seconds and an even-
tually existing external power supply (Pull the plug). If the problem
is gone, the telephone had a malfunction.
ቦ Disconnect the PBX from the external power supply (Pull the plug)
for 5 seconds. If the problem is solved, the PBX or the telephone
had a malfunction.
The Telephone can not be called
Check if your telephone is really not reachable. Try to make a call from
another internal telephone to you telephone.
No internal and external Calls
ቢ Eventually a subscriber Call Forwarding has been configured for
the telephone. You can switch this function off, if unwanted (see
p. 25).
ባ Eventually a do-not-disturb service has been configured for the tel-
ephone. You can switch this function off, if unwanted (see p. 30).
ቤ Disconnect the telephone from the PBX for 5 seconds and an even-
tually existing external power supply (Pull the plug). If the problem
is solved, the telephone had a malfunction.
ብ Please check if the ringer is deactivated or defective.
ቦ Disconnect the PBX from the external power supply (Pull the plug)
for 5 seconds. If the problem is solved, the PBX or the telephone
had a malfunction.
No inbound external Calls, but Calls from internal
Telephones are possible
ቢ Eventually a MSN/DDI Call Forwarding has been configured. You
can switch this function off, if unwanted.
ባ If you did not configure an external ringer rhythm with COMset for
the telephone, no external calls are possible.
ቤ If you did not configure an (partial) exchange line access with COM-
set for the telephone, inbound external calls are not possible. Out-
bound external calls are also not possible in this case.
ብ Please check the connection between the NT (NTBA or external S
0
bus) and the PBX.
ቦ Disconnect the PBX from the external power supply (Pull the plug)
for 5 seconds. If the problem is solved, the PBX or the telephone
had a malfunction.
ቧ You can check the function of the NT by directly connecting an
ISDN telephone (If you have a Point-to-point ISDN line, the tele-
phone must be compatible to the Point-to-point connection). If there
is still no telephoning possible, disconnect the NT from the external
power supply (Pull the plug) and the exchange line for 5 seconds.
If the problem is solved, the NT had a malfunction. If the problem
remains, contact your network provider for help.
No inbound Calls to the Group Number
ቢ To receive calls to the group number, you have to log in as a group
member „inbound“ (see p. 52).
ባ To be able to log into a group, your telephone has to be configured
as member of the group with COMset.
ቤ Eventually a group Call Forwarding has been configured for the
group. You can switch this function off, if unwanted (see p. 55).
No external Calls are reaching an internal Target Telephone
with a Call Forwarding activated
ቢ If you did not configure an (semi-restricted) exchange line access
with COMset for the target telephone, inbound external calls are not
possible. Outbound external calls are also not possible in this case.