IP Office 406 v2 - SIP & IP Phones over VPN

[afrogley]

I currently run an IP Office 406 v2 on 4.2.4, this has 39 extensions (some digital some IP). 3 of the extensions are in external sites connected via ADSL & site2site VPN.

I'm looking at a proposal to join a sister company on this system - they have a dozen fixed handsets but only ever use 3 or 4 external lines.
We would purchase 3 or 4 SIP licences for the system and route their incoming via this as well as their outgoing traffic so they get the right presentation number. I'm thinking of suggesting a mixture of 5610's and 5602's as the handsets.

The site2site VPN via ADSL (currently in place) has 448k upload speed on both sites and 6-8Mb download. The VPN carries very little data traffic - just my own remote support which I'll flip to a different line.

Cost savings would be £800 in the first year and over £2k in subsequent years - providing the system works!
Any comments (positive and negative please!)

 

[amriddle01]

The quality of this will depend entirely on the standard of the ADSL connection and if the providor tries to keep traffic between their own circuits or send it striaght off net. I have a few customers who have tried this and got all sorts of voice quality issues and dropped call, after all it's best effort on the WWW, putting both ADSL's onto a good providor can increase the quality and reliabilty a lot but it will not be a guaranteed service unlesss you pay for that

ACSS (SME)
APSS (SME)

http://www.ipoffice.tel

 

[afrogley]

I forgot to add - the system has VCM8 licence on a dongle and currently has 8 ip phones and vm lite.

 

[afrogley]

Thanks ... based in UK and on two different ISPs - but that could be changed (the ISPs not where we're based!)

 

[hairlessupportmonkey]

what andy said.

try and use providers at each end who are VoIP "friendly" with their traffic.

eg, we use Easynet a lot for more critical services, because their traffic from easynet to easynet is very well routed, and its routes dont load balance halfway through your phone call, unlike what griffen used to do to us....

 

[amriddle01]

Interesting you should mention Griffin, did you switch to easynet due to issues with Griffin and voice traffic etc?

ACSS (SME)
APSS (SME)

http://www.ipoffice.tel

 

[hairlessupportmonkey]

no - we switched from griffen to Enta - we always have used easynet for their premium services, like surestream