Dynamic extension/External hot desk

[Canuckvoip]

Gentlemen,
We were told that if a user has 3 outside/external destinations in the personal ring group, no B channels would be in use until one of the 3 deswtinations answered the call.
This I took with a grain of salt.
Upon upgrading to MCD 4 10.0.0.10_2 and testing with a Universal NSU and a pri from Allstream we find this to be inaccurate.

Perhaps it is available on certain pri suppliers or a feature I am unaware of?
Anybody else heard of this or tried to prove/disprove?

Cheers,
Dave

You can't believe anything you read... unless of course it's this sentence.

 

[slapin]

Sounds incorrect to me. In order to reach a remote number the system has to send a SETUP message in D channel. Content of the SETUP message contains B channel number. That means the system reserves this channel for this call until it will be connected or cleared. It doesn't use channel per se, nothing is being transmitted in this time slot, but other calls cannot use it at the moment.

It means that if you have multiple external ring groups with 8 members each, just 2 groups can be called over a single PRI.

BTW, what will happen if there is no enough trunk lines to call all external parties? Entire call will fail or the system will make an attempt to call just some of the external destinations?

http://www.lincoln.edu/math/rmyrick/ComputerNetworks/InetReference/126.htm

Look for IE Channel idntification.

SETUP (5)
IEs: Sending complete, Repeat indicator, Bearer capability, Channel identification, Progress indicator, Network specific facilities, Display, Keypad facility, Signal, Calling party number, Calling party subaddress, Called party number, Called party subaddress, Transit network selection, Repeat indicator, Low layer compatibility, High layer compatibility
Direction: Calling user -> network -> called user

Initial message sent to initiate a call

 

[TheMitelGuy]

Unfortunately whoever told you that was incorrect. It takes up one B channel for each call, no matter if it is ringing or answered. Once one of the external numbers answers, the other two B channels will clear down with Dynamic Extension. Until that take, if you have 3 or 5 or 7 numbers (all external) you are taking 3, 5 or 7 (respectively).

 

[Canuckvoip]

Thanks for the confirmation/validation peeps.
Mitel just ponied up/admitted it as well.

Dave

You can't believe anything you read... unless of course it's this sentence.

 

[TheMitelGuy]

Which Mitel office told you that?

 

[Canuckvoip]

As my login name suggests, it's north of the 49th parallel.
As west as you can get. At a high level.
:>)
Not interested in getting anyones Knickers in a knot but after living/breathing 27 years of telephony I had to prove/disprove.
It is officially disproven as per the PM of the product.
(As if we already didn't know...).


I just couldn't stand the idea that our sales dept might say something inaccurate.

Dave


You can't believe anything you read... unless of course it's this sentence.

 

[TheMitelGuy]

We call them "PLMs" not "PMs.

 

[Canuckvoip]

Hi MitelGuy,
If the "L" stands for launch I guess I thought that was over.
Not to worry.
:>)
Thanks for your input!

Dave

You can't believe anything you read... unless of course it's this sentence.