17.79. TWDS - Transfer Allowed without Disconnect Supervision 
Feature:
This attribute set means that this trunk can be connected to another trunk when none
of
them has Disconnect Supervision
Function:
General: Two trunks without Disconnect Supervision (meaning that they are not able
to signalize the release) can be connected together and this connection has to be
supervised.
The TWDS parameter set to "yes" for a trunk means that this trunk can participate
in a "Two
Trunks Supervised Connection".
Hints:
- This parameter has no meaning for trunks that provide Disconnect Supervision.
- If the trunk has no disconnect supervision and this parameter is set to "no" then the connection with another trunk that does not have disconnect supervision will not be allowed, so the number of the connection posibilities will be diminuated.
AMO-Interrelationships:
AMO COT Parameter DSIT, NRAA, NRBA, ANS
For Incoming trunks: IF DSIT set to "no" THEN
- TWDS set means that this trunk can participate in a supervised connection.
- TWDS not set means that this trunk can not participate in a supervised connection.
For Outgoing trunks: the following COT parameters are checked in AMO ANS, NRBA, NRAA
to
determine if the trunk has disconnect supervision. If no disconnect supervision is
provided
then the TWDS will reflect:
- TWDS set means that this trunk can participate in a supervised connection.
- TWDS not set means that this trunk can not participate in a supervised connection.
COT parameters' checks performed for disconnect supervision in the outgoing
direction:
IF ANS="no" THEN
IF NRAA="yes" and NRBA="yes" THEN
No disconnect supervision provided!
ELSE
IF NRAA="yes" THEN
No disconnect supervision provided
Device type:
Analog Trunks.
Protocol variants:
Analog