What sort of connection is necessary for VoIP to work?
Posted on 2006-05-16
What sort of connection is necessary for VoIP to work? Currently we've got an SDSL 768/768 supporting 3 incoming and 1 outgoing lines coming into a SwitchVOX (Asterisk) PBX. There are also four copper lines moving through the same box/network. The copper lines are perfect incoming and outgoing. I'm told the VoIP messages deposited on the PBX have no problems.
There does exist a problem somewhere between the VoIP phones and wherever the phone call is connected. I've run Ping Plotter from here to the address given to me by JunctionNetworks and it doesn't look good. I'm wondering if the problem might be that we're Nat'ed at least three times. I know this because some of the IP's off the tracert are 192.168.0.10 (our internal IP address) then 74.0.xxx.xxx (the inside interface of the Covad-supplied router), 172.31.255.253 (further down the chain), 192.168.5.65 (even further down the chain.) Many of the hops are identified by nycmny2wcx2-pos14-1.wcg.net or something very close to this. Right now, these hops are giving an average round trip of 31ms. However we often have dropped packets etc.
So I'm wondering what's the least expensive internet connection that's going to consistently give us acceptable phone service. I'd just go get a T-1 if cost was no object, but it is. We're currently spending $170/month for what we've got and it's making me very sad :( Any other solution suggestions are welcome.