SIP Trunking / BEST Voice Quality

[mobiledynamics]

Call me golden ears but I can hear the differences between a TDM vs IP handset. SIP VOIP call vs. non voip caller.

However, we're a SMB with minimal - minimal voice usage.
Our contract with our voice PRI is up...and the minimum in a voice PRI is still expensive compared to what I'm considering which is just putting 5 VOIP trunk into the IPO and decide from there.

Curry, Global Crossing, Paetec, etc.
Let me hear your thoughts on SIP trunking with these guys.

 

[TheDoz]

I personally would hesistate about going to SIP trunks at this time,unless you have plenty of band width available on the network. And it depends on how many hops it takes to get their and back (to SIP provider)etc.
Possible problems are voice calls cut in and out and/or static on SIP lines.
Just my opinion at this time.

"Religion is regarded by the common people as true, by the wise as false, and by the rulers as useful"
"The lack of money is the root of all evil"

 

[mobiledynamics]

Correct. I understand the MULTIPLE points of failure on a SIP session. We have a 8 meg upload and I'm comfortable from a in bound/outbound broadband network wise *infrastructure/backend/latency* etc.

So the 2nd part boils down the SIP provider. I'm leaning on Global at this point, as the pricepoints seem similar across the board - the biggest difference being Global has a more extensive network than the others.

Then again, I've seen weird latency issues on GLBX network from a data transit perspective.

Curry, Paetec, etc - we don't look at their data network....

 

[jamie77]

In the UK we use SIP to dial out for every call. all our incomming is on PRI. I cannot tell the difference between the 2.

We have a 1:1 voice only private ADSL for SIP running G711 so.

It's all about how you implement it.

Jamie Green

ACA:Implement - IP Office
ACS:Implement - IP Office

http://www.alliedcom.co.uk

Football is not a matter of life and death-It is far more important!!!!

 

[mattKnight]

>We have a 1:1 voice only private ADSL for SIP running G711 so.
I bet you'd notice the difference (degrade) running G729...

Intelligent use of various codecs will make a massive difference, in both speech quality and VCM usage.

Take Care

Matt
I have always wished that my computer would be as easy to use as my telephone.
My wish has come true. I no longer know how to use my telephone.

 

[tnlcom]

VOIP works fine on the IP Office if you have a dedicated Broadband for the voice. Use a Griffin provided ADSL MAX for 4 calls or MAX Prem for 8. This will save you loads of rental over a PRI circuit.

Use Voiceflex as this is supported by Avaya or Hipcom.

Both work well and should give you no problems.

You will need to cap the number of calls available to ensure you get good quality and use 64kALAW compression.

I have used this very configuration for some time now as have my customers and on the whole it works well but you must understand that it is broadband with no SLA and it is important therefore to invest in a Broadband provider you can speak to when you get problems.

The trade of for cheap line rental here is that occasionally you will loose service becasue it is Broadband not a dedicated line.

The outages are few and far between if the service is set up correctly and maintained properly and they will be for very short periods like 10 sec to 2 minutes unless you end up with a major fault but when that occurs you can swap to the Broadband you use for surfing temporarly which provides some resilience.

 

[mobiledynamics]

Lot's of fellas over the Pond I see ;-)

I'm comfortable on the redundancy on bandwidth in house as we have 3 providers coming into our premise (metro-ethernet, wimax and also DS3)

The way I'm looking at is is just moreso how we use voice, the usage incurred and from a #'s perspective, a PRI doesn't justify it anymore.

So SIP is where I'm looking, but we shall see what functionality I lose like sending info over the *D* channel.