
FIRMWARE DESCRIPTION
Data Mode
28
2.10
•
19.01.2007
3.3.4.4.1 Outgoing call, PT interface
In order to request a call, the PT-side host shall activate the DTRI signal (i.e. pull it to low
level).
An established call is indicated to the host through an activation of the DSRO signal. The
DSRO signal remains active for at least 10ms.
There might be several reasons why a call request may not be accepted by the peer:
•
Busy
condition
•
Out of coverage range
•
Invalid
subscription
•
Application-specific
reasons
The interface does not provide information about the actual reason.
If DSRO remains deactivate the host may continue the call request by retaining DTRI active.
The host may cancel a call request by deactivating DTRI before DSRO has become active.
3.3.4.4.2 Outgoing call, FT interface
To accept outgoing calls the FT-side host shall leave the DTRI signal permanently active. In
this state the FT accepts any outgoing call immediately.
The host shall reject the call by retaining DTRI deactivated.