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Vonage Location: Richmond, TX (just west of Houston)
ISP name and type: both
Location: Richmond, TX (just west of Houston)
ISP name and type: both ATT DSL and Comcast cable modem
Upload and download speeds: DSL 6 / 1.5, Cable, possibly 10 / 2.5, but with “PowerBoost”, who knows?
DSL Modem: Siemens SpeedStreem 4100, Cable Modem: Ambit U10C018
I have four Vonage adapters, (2) Motorola VT2542-VD, LinksysWRTP54G and D-Link VWR-VD.
Network setup is Modems > Linksys RV082 Router > Vonage Phone adapters
The RV082 does automatic fail-over in case of an Internet outage. The Vonage devices are plugged into ports that have QOS priority and the rest of the LAN plugs into a router port with lower priority.
The issue is related to using Vonage service when running on Comcast. It may help to know that until a few weeks ago, everything was working perfectly. I typically run with DSL as the primary ISP and Cable as the secondary simply because the Vonage performance is better on DSL. With that said, the cable modem has always worked reasonably well…just not as well as DSL. A few weeks ago we had a DSL outage so the RV082 tried to switch to cable. After some time and a service call, the diagnosis was that the modem had failed. The guy replaced the Toshiba modem with the Ambit modem, and everything seemed good. In fact, speed tests at speakeasy.net were the fastest that I have ever seen at this location. It was so fast that I thought we might try to run with cable as the primary ISP for a while and see how it went.
In short, it did not go well. The first problem I noticed was that incoming calls on the VT2542-VD devices had a problem where no audio could be heard on our end. I am not clear on whether the caller could hear us or not. The second problem had to with outgoing calls via the same Vonage device – there was a dial tone, and we could dial, but it would never ring. We could place outgoing calls via the other Vonage devices with no problems, although we did notice some cases where incoming callers could not hear us answering the phone.
Obviously, the new cable modem is suspect, but that fact that some of the Vonage devices work better than others seems to suggest that Vonage is playing a part in the problem as well.
Here are the results of Voip tests for both ISPs:
DSL:
Speed test statistics
-
Download speed: 5121368 bps
Upload speed: 630952 bps
Quality of service: 99 %
Download test type: socket
Upload test type: socket
Maximum download pause: 6 ms
Average download pause: 4 ms
Minimum round trip time to server: 1 ms
Average round trip time to server: 1 ms
Voip test statistics
-
Jitter: you -> server: 0.1 ms
Jitter: server -> you: 3.4 ms
Packet loss: you -> server: 0.0 %
Packet loss: server -> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Number of supported Voip lines: 10
Estimated MOS score: 4.0
Cable Modem
Speed test statistics
-
Download speed: 8149768 bps
Upload speed: 2032552 bps
Quality of service: 84 %
Download test type: socket
Upload test type: socket
Maximum download pause: 27 ms
Average download pause: 3 ms
Minimum round trip time to server: 1 ms
Average round trip time to server: 1 ms
Voip test statistics
-
Jitter: you -> server: 0.8 ms
Jitter: server -> you: 3.4 ms
Packet loss: you -> server: 0.0 %
Packet loss: server -> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Number of supported Voip lines: 34
Estimated MOS score: 4.1
As you can see, the QOS on DSL is better, which has always been the case, although the cable modem is quite a bit faster.
I guess my question is, has anyone else experienced similar problems after a modem replacement, and if so, how did you resolve the problem? Calling either Vonage or Comcast is just about equally frustrating. Vonage always wants me to take my entire system apart…even though our phone call would be terminated by doing so. Vonage does have some good support people at the top level, but I have found it to be VERY difficult to actually speak with those people. I am not sure if Comcast has any good support people or not, but if they do, I have never spoken to one.
Any ideas on this?
Thanks,
-Mark
Read The Full Thread: Problems with Comcast / Ambit U10C018 Modem
• Seems to make no sense . . . but I would disconnect the cable modem from the Linksys
• On that particular vpn 8 port router, have you configured it to give RTP (UDP ports
• Mark,
I would strongly recommend dumping that cable modem and grab a Motorola
• Mark,
I have dealt with dual WAN routers on many occasions so I am not sure how
• Sorry for the long delay...apparently the forum is not sending activity notifications
• Mark,
Don't be focused on your speed. Just because the cable connection provides
• Sure, I understand what you are saying. And DSL has always has worked better for
• While I agree the Ambit may be part of the issue since it is on our list of hardware
• Well…I don’t know what the statistics are, but there must be an awful lot of people
MrMark posted "Location: Richmond, TX (just west of Houston)
ISP name and type: both" on 12/17/2008 |
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