Re: [edlug] SIP Trunk providers and IP handsets -- Slightly OT

----- "David" <david@xxx.xxx.xxx> wrote:
> Hello Everbody,
>
> A charity that I help out is looking at rationallizing and replacing/upgrading their phone service from PSTN to something newer and more advanced.
>
> Being mostly a linux guy, naturally I suggested some sort of Linux Asterisk based solution. There are 4+ offices throughout Edinburgh that need to be upgraded, so I'm wondering who are good trunk providers?
>
> I need a cheap ip handset for system testing, does anyone know where I could get one, or if I could potentially borrow one?
>
> Is SIP over ADSL/MPLS the way to go? Is there something else that we should be looking at?
>
> Anythoughts as to things that we definitely should not do? (After the initial testing phase, we are going be keeping the phone network (routers/switchers/servers/drops) infrastructure isolated from the computer network infrastructure)

Hi David,

Here's a good link to read http://blog.voipsupply.com/voip-phone-system-mistakes-avoid and also some questions you must first ask yourself:

1. What is your current system like and your usage paths/patterns? (dictates level of system)
2. Who is in charge of it?
3. How many calls do you make at one time? (dictates bandwidth/codec choices)
4. Are most of your calls interoffice?
5. What kind of users do you have? (dictates IP phone level)
6. What kind of backup will you have? (outbound fall back to PSTN and inbound fall back to external VoIP or PSTN system)
7. Do you need hosted or in house?
8. What kind of handsets do you have now? (possibly ATA will be cheaper if you just need basic use)
9. What are your local networks like?
10. What are your timescales?
11. Do you have remote users?
12. Do you need call recording?
13. What is your budget? (maybe first question?)

Many more questions will be generated from the answers to above ;-)

Thanks,

Gavin.

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Gavin Henry.
Managing Director.

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