Warpslide wrote to claw <=-

I'm using voip.ms with a Cisco SPA112 ATA. The ATA is connected to a
USR Sportster 56k modem which is connected to a USB to serial adapter.

So voip.ms works well with modems? Some VOIP providers do not work so
well, especially at higher speeds (2400 or 9600+). Also if you have a voip service, what is the Cisco hardware for?

Thanks!


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On 28 Apr 2023, Blue White said the following...

So voip.ms works well with modems? Some VOIP providers do not work so well, especially at higher speeds (2400 or 9600+). Also if you have a

Yeah, voip.ms works well enough, you just have to make sure you're using G.711u for the codec, there's a few other tweaks you can make on the ATA side to make things a little more reliable. (Jitter, silence suppression, echo cancellation, rtp packet size).

I've connected at 14.4 & 28.8 and it worked quite well, a little line noise here & there at 28.8.

Also if you have a voip service, what is the Cisco hardware for?

The Cisco box is the ATA that provides the phone jack the modem plugs into so it can talk to voip.ms.


Jay

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So voip.ms works well with modems? Some VOIP providers do not work so
well, especially at higher speeds (2400 or 9600+). Also if you have a
voip service, what is the Cisco hardware for?

Actually, my experience has been that VOIP works *better* with higher speed modems (14.4, 28k, and (especially) 56k) not because of the speed of the
modem, but because of compression / error correction features they have that slower, older modems do not. My 56k v.92 modem works better than any of the other ones I have.

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Warpslide wrote to Blue White <=-

I've connected at 14.4 & 28.8 and it worked quite well, a little line noise here & there at 28.8.

Also if you have a voip service, what is the Cisco hardware for?

The Cisco box is the ATA that provides the phone jack the modem plugs
into so it can talk to voip.ms.

Sort of like the MagicJack contraption does. So do they provide that Cicso hardware, or is that something you chose because it works better?



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On 29 Apr 2023, Blue White said the following...

Sort of like the MagicJack contraption does. So do they provide that Cicso hardware, or is that something you chose because it works better?

VoIP.ms is a BYOD (Bring Your Own Device) provider, so you can use any compatible hardware or software.

In the past I've used the Linksys PAP2T which I set for my Mom up with when she wanted to cancel her landline due to cost, so I got the Cisco SPA112 for myself.


Jay

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Blue White wrote to Warpslide <=-

I've connected at 14.4 & 28.8 and it worked quite well, a little line noise here & there at 28.8.

Also if you have a voip service, what is the Cisco hardware for?

The Cisco box is the ATA that provides the phone jack the modem plugs
into so it can talk to voip.ms.

Sort of like the MagicJack contraption does. So do they provide
that Cicso hardware, or is that something you chose because it
works better?

The voip.ms service doesn't provide the hardware. You sign up with them
to get a phone number, basically, and the Cisco ATA translates phone to internet (via LAN/ethernet connection).

I have been doing this setup this week to add dialup to my system, and
it seems to be working pretty well (gonna advertise it soon). I got a Grandstream brand ATA from Amazon for $40 and it works well.



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So voip.ms works well with modems? Some VOIP providers do not work so well, especially at higher speeds (2400 or 9600+). Also if you have a voip service, what is the Cisco hardware for?

Some voip providers offer support for "Fax" service, in the case of voip.ms you have to request it... usually this means you should be able to get 9600-14.4 give or take without much issue. You should do some testing and configure your modem not to negotiate at higher than 14.4 or 19.2k connections.

The cisco box connects to a VOIP line over ethernet/internet and will provide line service for a POTS device (such as a standard modem).


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Hello Tracker1,

02 May 23 00:22, you wrote to Blue White:

So voip.ms works well with modems? Some VOIP providers do not
work so well, especially at higher speeds (2400 or 9600+). Also
if you have a voip service, what is the Cisco hardware for?

Some voip providers offer support for "Fax" service, in the case of
voip.ms you have to request it... usually this means you should be
able to get 9600-14.4 give or take without much issue. You should do
some testing and configure your modem not to negotiate at higher than
14.4 or 19.2k connections.

The cisco box connects to a VOIP line over ethernet/internet and will provide line service for a POTS device (such as a standard modem).

which codec do you recommend for modem communications?

Regards,
--
dp

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Roon wrote (2023-05-04):

Hello Tracker1,

02 May 23 00:22, you wrote to Blue White:

So voip.ms works well with modems? Some VOIP providers do not
work so well, especially at higher speeds (2400 or 9600+). Also
if you have a voip service, what is the Cisco hardware for?

Some voip providers offer support for "Fax" service, in the case of
voip.ms you have to request it... usually this means you should be
able to get 9600-14.4 give or take without much issue. You should do
some testing and configure your modem not to negotiate at higher than
14.4 or 19.2k connections.

The cisco box connects to a VOIP line over ethernet/internet and will
provide line service for a POTS device (such as a standard modem).

which codec do you recommend for modem communications?

G.711 aka ulaw / alaw. It's the same codec that ISDN uses and that was used when POTS moved from analog to digital infrastructure.

⁂

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On 27 Apr 2023, Warpslide said the following...

I'm using voip.ms with a Cisco SPA112 ATA. The ATA is connected to a USR Sportster 56k modem which is connected to a USB to serial adapter.

* Cisco phone adapters vulnerable to RCE attacks, no fix available *

Cisco has disclosed a vulnerability in the web-based management interface of Cisco SPA112 2-Port Phone Adapters, allowing an unauthenticated, remote attacker to execute arbitrary code on the devices.

Tracked as CVE-2023-20126 and having a "critical" CVSS score of 9.8, this vulnerability is caused by a missing authentication process within the firmware upgrade function.
[...]
While these adapters may be used in many organizations, they are likely not exposed to the Internet, making these flaws mostly exploitable from the local network.
[...]
Since Cisco SPA112 has reached the end of its life, it is no longer supported by the vendor and will not receive a security update. Also, Cisco has provided no mitigations for CVE-2023-20136.

https://www.bleepingcomputer.com/news/security/cisco-phone-adapters-vulnerable- to-rce-attacks-no-fix-available/



Always fun to know. Luckily mine isn't exposed to the open internet.


Jay

... A gathering of optometrists is called a focus group

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which codec do you recommend for modem communications?

Not sure, been better part of a couple decades since the last time I played with a modem or fax over a voip service...


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tracker1@roughneckbbs.com
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