[cisco-voip] Adding DIDs to a PRI - and how to limit total calls to those DID numbers.

Wed Oct 24 10:26:07 EDT 2012

Thanks Scott!

Would that 'dedicating 8 channels inbound' be done via a trunk group? or
would RightFax just handle that?

What I'm considering is just porting the numbers from the analog DID
trunks over to an existing PRI, which already is a trunk group with
another PRI.

It'd be good if I didn't need to complicate the PRI configuration with
AT&T by adding more trunk groups on the same PRI.

The same PRI I'm using is currently one of our primary voice trunks for
callin/callout, so

I don't know that I'd want to permanently dedicate channels for
exclusive fax use.

I'm also working out the pros/cons of adding a whole PRI for the purpose

So I'm working out the details and possibilities for both options.  I'd
like to have a separate PRI for faxing, which would make a lot of things
easier,

including moving faxing to another router if needed in future, etc. 

Thanks, Tim

From: Scott Voll [mailto:svoll.voip at gmail.com] 
Sent: Wednesday, October 24, 2012 10:08 AM
To: Tim Reimers
Cc: Chris Clouse; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Adding DIDs to a PRI - and how to limit total
calls to those DID numbers.

Right Fax may be your solution.  you have to license how many concurrent
calls the Right fax server can have. (I believe both inbound and
outbound).  so you could just dedicate 8 channels inbound then
everything else will receive a busy....

YMMV

Scott

On Tue, Oct 23, 2012 at 2:51 PM, Tim Reimers <treimers at ashevillenc.gov>
wrote:

That does look very much like what I'm considering -

Lelio, I am going to investigate options with the telco as well -

One thing I have to determine is whether we want to do a separate PRI
and incur that monthly cost.

That would give me the option of controlling this from the carrier side
as well.

I'm going to try to get this lit up using Hylafax and t38modem as a test
platform.

Same diagram as below, but I'm going to use Hylafax as a temporary
test-FoIP platform to straighten out the Cisco side

before moving on to the Rightfax phase of the project:
migration-from-old-RF version-to-newest-version-of-RF 

Ultimately, this will be a simple

PSTN >> PRI >> DID number #1515 (for ex,) >> Cisco 2821 >> H.323 to
RightFax SR140 module.

So no real integration with Callmanager or any of that - Just no need to
make it that complicated.

(unless I'm missing something about how awesomely easy and incredibly
flexible and low-cost it would be if I involved UCM in this    ....;-)

Thanks, Tim 

________________________________

From: Chris Clouse [mailto:Chris.Clouse at cdw.com]
Sent: Tue 10/23/2012 3:11 PM
To: Tim Reimers; cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Adding DIDs to a PRI - and how to limit total
calls to those DID numbers.

I would investigate using 'max-conn' on your dialpeers.

http://www.cisco.com/en/US/docs/ios/solutions_docs/voip_solutions/CAC.ht
ml#wp902617

~Chris

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Tim Reimers
Sent: Tuesday, October 23, 2012 1:52 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Adding DIDs to a PRI - and how to limit total
calls to those DID numbers.

Hi everyone -

I've been asked a question that I don't know if I've heard before -

I have two existing PRI circuits, built as a single trunk group, with
about 1000 DID numbers on them, used for voice calls.

(for sake of mentioning it, the PRIs arrive on two different routers,
and all the DIDs are reachable inbound on either one)

Someone wants to add more DIDs for the purpose of faxing, with those
DIDs being dedicated for fax usage, not for voice calls.

But they want to limit the total number of calls that will be allowed to
come in, so that we don't 'eat' all 47 channels with attempted inbound
faxes.

How would I limit the allowable calls coming in to the DIDs 1500-1700
and 2100-2300  ?

(assuming 4-digit delivery from the telco)

One factor that might do it is that the session-target device mentioned
below

only has two active channels - 

Would that have the effect of stopping the 3rd, 4th, etc call and
sending them back to the carrier

with a busy signal? 

I don't want a re-order tone - just busy.

Or would I use the 'max-conn' option as shown below under the dial-peer
to ensure that

no more calls can come in?

I think my dial peers would look like this:

dial-peer voice 1000 voip

description Inbound faxes

destination-pattern 1[5-7]..

max-conn 2

session target ipv4:192.168.200.17

session transport udp

dtmf-relay h245-signal

codec g711ulaw

fax rate 14400

fax protocol t38 ls-redundancy 5 hs-redundancy 2 fallback none

no vad

!

dial-peer voice 1000 voip

description Inbound faxes

destination-pattern 2[1-3]..

max-conn 2

session target ipv4:192.168.200.17

session transport udp

dtmf-relay h245-signal

codec g711ulaw

fax rate 14400

fax protocol t38 ls-redundancy 5 hs-redundancy 2 fallback none

no vad

!

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