Operation Manual

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Appendix A: Technical Information on GSM Operation
In remote access over ISDN it is common practice for CAPI
applications to identify the caller’s ISDN number before
accepting an incoming call. In order for the ISDN-Controller
called to be able to process the GSM caller’s number, the
GSM user must have the additional service CLIP (Calling
Line Identification Presentation). Please ask your GSM
network operator or service provider for details.
A.1.2 ISDN V.110
Please note that the applications interface CAPI 2.0 alone
is not sufficient to allow the Mobile ISDN-Controller
M2 to call any ISDN device! Since the D1 and D2 GSM
operators use the synchronous V.110 protocol for bit-
rate adaptation over the ISDN link of the connection,
communication with V.110 dial-in ports is simple. Please
make sure that this protocol is also selected in your ISDN
applications, such as FRITZ!com or CAPI Port driver,
since the remote site may otherwise terminate the
connection immediately.
A.1.3 Analog Modem V.32
The analog modem protocol V.32 is supported in
accordance with CAPI 2.0 for both incoming and outgoing
connections. FRITZ!com is an ISDN application which can
use this protocol. To operate conventional modem
software, please use a CAPI 2.0 Fossil driver or the AVM
ISDN CAPI Port driver.
A.1.4 Group 3 Telefax
Group 3 telefax is supported in accordance with CAPI 2.0
for both incoming and outgoing connections.