Any experience with Comcast digital voice for OOB (offlist is fine)
Sincerely, Eric Tykwinski TrueNet, Inc. P: 610-429-8300 F: 610-429-3222
----- Original Message -----
From: eric-list@truenet.com
Subject: Any experience with Comcast digital voice for OOB (offlist is fine)
You're asking if a VoIP link could be used with traditional modems to do OOB management? I'm pretty sure the answer is a flat no: any modems faster than 1200 bps depend on phase change modulations that VoIP codecs can't begin to deal with; FoIP is implemented by spoofing: the TA detects CNG tone, and spoofs a datalink. I don't know of any TAs that will do that with regular data modems. Cheers, -- jra -- Jay R. Ashworth Baylink jra@baylink.com Designer The Things I Think RFC 2100 Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274
I've had problems with DTMF originating from comcast voice in the past (going into t1/pri from xo terminated on Cisco-ISR with voice modules). Was a pain to troubleshoot. I would be interested to hear your results, much depends on how they implement the service. - Jared
On Feb 28, 2014, at 2:27 PM, <eric-list@truenet.com> wrote:
Sincerely,
Eric Tykwinski TrueNet, Inc. P: 610-429-8300 F: 610-429-3222
As others have said modems require POTS or at least a PBX line. Also isn’t the hand-off fog VoIP ethernet? You wouldn’t be able to stick that into the RJ-11 port in the modem. It would be easier to use the comcast internet connection with some sort of IPsec tunnel for OOB. It’s cheap and mostly reliable. If you’re looking for a better solution see the thread on OOB gear RE: opengear. They are multi-port and support, POTS, wifi and 3G for access. On Feb 28, 2014, at 2:27 PM, eric-list@truenet.com wrote:
Sincerely,
Eric Tykwinski TrueNet, Inc. P: 610-429-8300 F: 610-429-3222
Thanks all, Jared, sorry I forgot about out-of-band touch tones and should of specified better, the client was looking to use a modem like most guessed. I suggested using a cellular option since POTS wasn't available, as most gear usually has that as an option, and it looks like US Robotics makes a serial connection modem at that. I do remember though something about a modem over VoIP protocol being developed, something like Jay was saying about Faxing over VoIP, but I guess it never took off. My guess being relying on the same line as an internet connection would be about that smart anyways. Sincerely, Eric Tykwinski TrueNet, Inc. P: 610-429-8300 F: 610-429-3222 On Mar 1, 2014, at 1:49 PM, Keegan Holley <no.spam@comcast.net> wrote:
As others have said modems require POTS or at least a PBX line. Also isn’t the hand-off fog VoIP ethernet? You wouldn’t be able to stick that into the RJ-11 port in the modem. It would be easier to use the comcast internet connection with some sort of IPsec tunnel for OOB. It’s cheap and mostly reliable.
If you’re looking for a better solution see the thread on OOB gear RE: opengear. They are multi-port and support, POTS, wifi and 3G for access.
On Feb 28, 2014, at 2:27 PM, eric-list@truenet.com wrote:
Sincerely,
Eric Tykwinski TrueNet, Inc. P: 610-429-8300 F: 610-429-3222
On Saturday, March 01, 2014 10:20:29 PM Eric Tykwinski wrote:
I do remember though something about a modem over VoIP protocol being developed, something like Jay was saying about Faxing over VoIP, but I guess it never took off. My guess being relying on the same line as an internet connection would be about that smart anyways.
FoIP (Fax over IP) is "dodgy" for a couple of key reasons: a) Different call capabilities, during setup, of SIP and T.30, where a portion of the segment is TDM. b) Different FoIP modes, during setup, where one end uses SIP and the other uses T.38, with an inability to propagate these capabilities across the circuit. c) Signaling delay between initial INVITE and 200 OK, introduced due to SIP-SS7-SIP conversion. d) TDM-IP-TDM conversions causing incorrect training across the circuit. e) Low-rate codecs in the transit path that are not signaled to the end points, e.g., end points running at g.711 while an intermediate device runs at g.729. My guess is modems would have the same issues. In general, FoIP solutions have a better chance of working if a circuit provisioned to transmit a fax is all-IP (or, at the very least, limits the TDM-IP conversions). If all else fails, scan and e-mail. Mark.
participants (6)
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Eric Tykwinski -
eric-list＠truenet.com
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Jared Mauch -
Jay Ashworth -
Keegan Holley -
Mark Tinka