Mitel IP Trunking on the 3300

Mitel IP Trunking on the 3300
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Subject Author Date
Mitel IP Trunking on the 3300 jneiberger 09-13-2005
Posted by jneiberger on September 13, 2005, 9:43 pm
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I have a question about IP trunking and call admission control on the
3300, and I'm hoping someone here might be able to answer it.

I'll try to do a diagram to explain my question a little better.
Imagine the following network:

A
/ \
/ \
B ----- C

The lines represent the IP trunks on the 3300, not physical circuits;
however, we'll assume that these sites are fully meshed from a network
perspective, as well.

Now, let's say we have a maximum of three calls configured per trunk.
If there are already three calls in place between A and B, what happens
when one more person at A tries to call B? Will the call be blocked
because the IP trunk between A and B is full, or will the 3300 at A
realize that there is another path to B through C?

Thanks,
John



Posted by Ian on September 14, 2005, 3:52 pm
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> I have a question about IP trunking and call admission control on the
> 3300, and I'm hoping someone here might be able to answer it.
>
> I'll try to do a diagram to explain my question a little better.
> Imagine the following network:
>
> A
> / \
> / \
> B ----- C
>
> The lines represent the IP trunks on the 3300, not physical circuits;
> however, we'll assume that these sites are fully meshed from a network
> perspective, as well.
>
> Now, let's say we have a maximum of three calls configured per trunk.
> If there are already three calls in place between A and B, what happens
> when one more person at A tries to call B? Will the call be blocked
> because the IP trunk between A and B is full, or will the 3300 at A
> realize that there is another path to B through C?
>
> Thanks,
> John

Ip trunking uses the same rules as normal trunking. So as long as you have a
route list setup to that then yes it will.

Ian




Posted by jneiberger on September 14, 2005, 9:22 am
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What if this is for internal IP calls only? I was told that with the
3300 we would not have to do any configuration regarding a dial plan
for internal calls and that all PBXs would automatically learn where
all internal extensions resided. Based on your response, it almost
sounds like we'd have to construct a dialing plan for internal calling
as well as for external calling.

Is that true?



Posted by Ian on September 14, 2005, 7:22 pm
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> What if this is for internal IP calls only? I was told that with the
> 3300 we would not have to do any configuration regarding a dial plan
> for internal calls and that all PBXs would automatically learn where
> all internal extensions resided. Based on your response, it almost
> sounds like we'd have to construct a dialing plan for internal calling
> as well as for external calling.
>
> Is that true?
>
No

A call to an extension on switch B from switch A is an external call.
Even if your system clustered or resilaint. a user it looks like one
system but routes are still setup between systems s users can call between
systems.

How much do you know about sysadmin on the 3300 ? Do you understand ARS and
route lists ? If you do I will be happy to explain in more detail.

Ian




Posted by jneiberger on September 14, 2005, 12:58 pm
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I'm only slightly familiar with ARS. My company is evaluating a couple
of different VoIP solutions and Mitel is one of them. I'm trying to
make sure I understand this subject because it has some pretty serious
design implications for us.

So, let's say we started out with the three-node site I mentioned
earlier. Later, we a fourth site, then a fifth site, and so on. Will I
need to go back to the previously-installed PBXs and configure ARS so
that they know how to reach the internal extensions at the new sites?



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