[cisco-voip] Ireland Office on US CUCM

[Tim Smith]

Hi Sean,

That can technically be done, but you would need to be careful of the network connectivity between your Irish office and US.
Think about a person picking up a phone in Dublin, phones goes off hook and sends a message across the world to figure out what it should do next :)
If you have a WAN in place do some ping testing and see what results you get, RTT times, how consistent are they
If you don’t have a WAN then make sure you are asking what kind of latency and packet loss you can expect, are they covered under an SLA
If you are thinking of doing it over the internet with a VPN, then definitely read my suggestions below!
You could get local numbers delivered by VoIP to the US, but again, now you would have not only signalling but media travelling across the world.

My suggestions..
Get local PSTN connectivity (Eircom and BT are the big carriers – you didn’t specify North or Republic. Eircom biggest in Republic, BT biggest in North – there are others too)
Put a local gateway in.. These days you could go SIP, but ISDN still works.
I would put a local CUCM in as well and I would create a trunk between your Irish CUCM and US CUCM's..
If network is good you can route internally over WAN, if not you can route around via PSTN
You can also add local voicemail etc.
Check out the BE6k S platform, if it's a small office this is a great option.

You can set up the dialling however you like. You can use site codes, +e164, or short dialling.
These days, you'd usually allow +e164 and some short dials
For soft clients and VC type endpoints also valid to dial via SIP uri.

US vs Ireland – this is all done via CSS, PT, Route Plan. You engineer it so Irish phones see patterns that point to the Irish trunks
Device mobility, local route groups can be used to make these setups more efficient.
Really lots of different ways to do it – I suggest checking out some Cisco Live presentations and SRND as they have great examples of how you can build this.
The good (and sometimes bad) thing about CUCM is it is very flexible and you can really do this any way you want.
The trick is to try and make it as simple and efficient as possible while providing the functionality that your users.

Hope some of that helps!

Cheers,

Tim

From: cisco-voip <cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net>> on behalf of "Sean E. Knight" <sean at 14west.us<mailto:sean at 14west.us>>
Date: Thursday, 3 March 2016 at 02:57
To: "cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>" <cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>>
Subject: [cisco-voip] Ireland Office on US CUCM

Hello,  have some questions.  We are building an office in Ireland and would like to get them local to Ireland phone numbers.  We would need to order them from Ireland but would like to have them added to our CUCM in Maryland.  It would be useful for dialing internally back and forth (not sure what the digit could would need to be).

So my questions are:


Can this be done?

Where would we need to order a block of number from?

Would dialing internally be a 4 digit dial or more?

In terms of dialing locally for them how would the Call Manager differentiate from local to US and local to Ireland?

What other configuration problems would I need to look at?

Has anyone done this before?

Any help will be greatly appreciated.


Sean


Sean E. Knight
Network and Telecommunications Administrator
sean at 14west.us<mailto:sean at 14west.us>
  410-864-1805

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