1/24/2021
Tech Works MC-IP-Series System Planning & Installation Manual
Page 29 of 32
Responses have been added to help with understanding why a command was not able to
be processed. Here are the following responses.
“Npos” – Forward Not Possible -
This is sent when a forward is not possible.
If an attempt to create new forward that would create an endless loop were to be
sent, a Npos response would be sent indicating that the forward is not possible at
this time.
“Ncon” – No Connection Possible -
This is sent when an action is not allowed due to the
configuration.
If the configuration was set for ODC1 to not accept external calls and someone
attempted to call it, a Ncon response would be sent indicating that ODC1 is not
configured to allow this action.
When a station presses a button a Icrq [ODC]
[station] is sent to all ODC’s it has been
configured for. When an ODC answers the call by sending a Ical [ODC] [station], a Ican
[ODC]
[station] is sent to all the pending ODC’s and a Icom [ODC] [station] is sent to
indicate who took the call. When the call is done a Iend [ODC] [station] is sent.
When doing ODC to ODC calls, the process is essentially the same. The one difference is
in the Mcal and Mcrq because an ODC can be configured to not auto answer. If a Mcal is
sent and the destination ODC is not configured to auto answer, a normal Ackd response
will be returned and a Mcrq will be generated. And the ODC will ring. A Mcal will then need
to be sent from the original destination ODC to connect the call.
Example:
ODC 1 calls ODC 2 and ODC 2 has the auto answer turned off.
Outgoing: Mcal [ODC1] [ODC2]
Incoming: Ackd Mcal [ODC1] [ODC2]
Incoming: Mcrq [ODC1] [ODC2]
ODC 2 would be ringing.
To connect the call;
Outgoing: Mcal [ODC
2
] [ODC
1
]
Incoming: Ackd Mcal [ODC
2
] [ODC
1
]
Incoming: Mcom [ODC
2
] [ODC
1
]
