|
|
aug
Registration Date: 01.01.1970
Posts:
|
|
|
08.04.2007 21:31 |
|
Dia
Premium Account
Registration Date: 03.03.2006
Posts: 1443
|
|
I will provide some comments relevant to this discussion, under the original points so we can have some perspective, while looking for a carrier.
- Call quality. Be it re-invites or servers/gateways everywhere call quality is a top requirement.
• A lot depends whether your ATA or IP phone has a public IP. SIP re-invites work with public IP addresses and most of the times yield much better call quality. Hop count to the PSTN gateway or SIP endpoint, not the SBC, is what makes a perceptible difference in call quality, provided we have access to quality termination.
- Reliability. Should have almost no history of downtime. Reliability is critical.
• Such expectations are unrealistic. Build your Outbound Route 2 or 3 deep. When a call fails for any reason on the first carrier, it will jump over to the 2nd and 3rd route, provided the first carrier returned the correct SIP response code. Quality carriers only charge you per minute rates, so having 2 or 3 does not cost you until you use them.
- Work well with PBXes. Particularly, I'd like to avoid too much pain in setting up DID direct to extensions.
• Initial configuration of a DID can be challenging, but depending on the country you require the DID from, there are example configurations on the forum. Alternatively you can request the service to have the DIDs setup in your account directly.
- LNP would be nice, but not critical
• LNP on DIDs outside North America is between a major pain to almost impossible, and even in North America has not been perfected yet.
One additional note which has to do with call quality, but is not directly related to any carrier, is the move from an ATA to an IP Phone. Our voice is digitized in one step, from an analog wave to RTP packets, without an intermediate step. A very crucial but often overlooked weak link, which can make a difference.
PS. Let us know to which countries you are looking for termination and DIDs, so we can offer some suggestions.
This post has been edited 2 time(s), it was last edited by Dia on 11.04.2007 at 03:15.
|
|
11.04.2007 03:03 |
|
i-p
Super Moderator
Registration Date: 14.01.2006
Posts: 4775
|
|
|
27.07.2007 22:26 |
|
|
|
|
|
|
|