I have an interesting observation which I thought I'd pass along to save other people from spending time trying to 'fix' it. One of my clients uses Charter's so called "business phone service". They provide 'analog' phone lines over IP. In general, they've worked OK. End users were saying that the phone are "cutting out" at times. What I've observed is they actually do "cut out" (meaning all inbound audio is momentarily lost) if a loud noise is created on the local end. This client has a machine shop so you can imagine that at times it does get quite loud. I spent a few hours trying to different setting in the Polycom phones, but finally thought I'd try plugging an analog headset into the Charter CPE device directly. The same behavior was experienced. It appears they have a 'feature' which cuts out the incoming audio if a loud noise (simulated by blowing into the receiver) is experienced outgoing. Pretty much going to a true analog service is the only solution that I can think of. Would be interested if anyone has other thoughts. Darrick
My understanding is that Charter 'telephone' doesn't use IP at all but rather uses some additional frequency spectrum on their cable network. Hence, the reason why faxing with their service is reliable unlike other providers who are *actually* using VoIP. It sounds like they're suffering from clipping of some sort or almost a half-duplex audio situation. Weird. I've seen some el-cheapo cordless phones behave this way but never a 'business' solution. Eek. Tim Nelson Systems/Network Support Rockbochs Inc. (218)727-4332 x105 ----- "Darrick Hartman" <dhartman at djhsolutions.com> wrote:> I have an interesting observation which I thought I'd pass along to > save > other people from spending time trying to 'fix' it. > > One of my clients uses Charter's so called "business phone service". > They provide 'analog' phone lines over IP. In general, they've worked > > OK. End users were saying that the phone are "cutting out" at times. > > What I've observed is they actually do "cut out" (meaning all inbound > > audio is momentarily lost) if a loud noise is created on the local > end. > This client has a machine shop so you can imagine that at times it > does get quite loud. > > I spent a few hours trying to different setting in the Polycom phones, > > but finally thought I'd try plugging an analog headset into the > Charter > CPE device directly. The same behavior was experienced. It appears > they have a 'feature' which cuts out the incoming audio if a loud > noise > (simulated by blowing into the receiver) is experienced outgoing. > > Pretty much going to a true analog service is the only solution that I > > can think of. Would be interested if anyone has other thoughts. > > Darrick > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users
----- "David Gibbons" <dave at videon-central.com> wrote:> I think what you're referring to is the general hesitance of the cable > providers to call their phone service VOIP service. VOIP still has a > negative connotation with most regular folks, so they don't want to > negative PR.True.> > I'm don't have any facts, but I'll bet you a penny that they don't > have a proprietary system using something /OTHER/ than IP to send > encapsulated voice over 'additional frequency spectrum'. That would be > prohibitively expensive to develop and pointless from a technical > standpoint, given that IP telephony is already set to deploy and > relatively mature. >True.> The reliability of faxing is based soley on network jitter and latency > and codec compression. I've found that taking the compression out of > the mix (using g.711 ulaw) and controlling the jitter and latency > (something that's easy to do on a private network like theirs with > QOS) causes faxing to be pretty darn reliable. > > --DaveAlso True. I'd be willing to bet *TWO* pennies that you're correct. I certainly was not coming into the conversation as an expert, just stating what I'd read/heard of their service... hence the "My understanding is that..." beginning to the email. :-) Tim Nelson Systems/Network Support Rockbochs Inc. (218)727-4332 x105
"Digital Phone Service" is a Fancy Marketing term Meaning "Expensive VoIP" http://ezinearticles.com/?Digital-Phone-Service-is-a-Marketing-Term-for-Relabled,-Expensive-VoIP&id=262018 Pure VoIP vs. Telephone and Cable VoIP http://www.tmcnet.com/news/2006/08/16/1809766.htm A telephone call over IP is what it is... Voice over IP. =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ J. Oquendo SGFA, SGFE, C|EH, CNDA, CHFI, OSCP "Enough research will tend to support your conclusions." - Arthur Bloch "A conclusion is the place where you got tired of thinking" - Arthur Bloch 227C 5D35 7DCB 0893 95AA 4771 1DCE 1FD1 5CCD 6B5E http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x5CCD6B5E