Kuhnt AS55 Series, Service Manual

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SERVICE MANUAL AS55X
55Xseries_manual_V3.22 (18-08-15) www.kuhnt.com 167
8.15.2 Problem solution

FAX number not displayed by default
As GSM networks always display the voice number with outgoing FAX
calls and a FAX-callback to this number must fail, this number is now
suppressed by default. By clearing the unnamed bit 74, this
suppression stops.

Redesign of operator selection
With some cellular modules, changing of the operator selection is a
time consuming process. This lengthens startup duration and causes
problems in conjunction with the searching for the best network of
provider SimSwitch with different operator selections.
Operator selection will be performed no longer. Now it will be
checked if the module is registered to the requested network. In
exceptional cases where the requested network is not the home
network to the SIM, this process could fail. With setting of the
unnamed bit 82 the former behaviour will take place again.

SIP problem with authentication
If the AS55X is configured as SIP server with authentication (entries in
the authorized client list with passwords) and if the SIP client answers
to the authentication request from the server within microseconds,
this can result into a rejection by the server. This problem is solved.