ISP Trunk Session ID?


Hi folks,

What I trying to do here is exactly this:

My provider given me a Huawei modem which have 2 phone jacks on it, but instead of using it I rather redirect my POTS number to my PBX. I ran into couple of bumps on the road but now it's "half-working". I extracted the SIP user, pass, server info from the modem and even managed to put my PBX into the same VLAN they use, on the exact same IP address like the modem but there is 1 problem: It seems this modem also sends some session ID to the…

Asterisk Users 2.3 years ago 3 Answers

t38modem v2, which version or patch of asterisk?


Hi I'm developing for my company an Asterisk+t38modem+Hylafax solution.
I'm struggling in asterisk< ->t38modemv2 comunication. I've tried lot of
asterisk version but noone seem to function well. In asterisk
for example i can receive fax but I'm not able to send faxes due to a
"SIP/2.0 488 Not acceptable here" in asterisk 1.6 and 1.4 T38 codec
seems to be unsupported.
Asterisk 1.4.20 reports:
channel.c:3153 ast_channel_make_compatible: No path to translate from
SIP/T38modem-0-084e8dd8(256) to SIP/audiocodes_mp114-084d7858(8)
Is there an Asterisk version that could go with t38modem?
thank a lot.

Asterisk Users 3.7 years ago 0 Answers

T.38 "client" for Linux?


I am looking for a simple way to send occasional faxes via the FXO
port on my SPA3102 -- without having to connect a fax modem to an
ATA. In an ideal world, this would be some sort of "softfax" that
runs on my Linux desktop and talks (via Asterisk) to the SPA3102 with
T.38. This is one of those things that I thought would be relatively
straightforward, but a couple of hours of Googling has left my head
spinning. I'm posting here in the hope that there is a (fairly) simple way to

Asterisk Users 4 years ago 1 Answer

Dragging the dialup customers along, possible?


On Mon, Aug 29, 2011 at 4:32 PM, Cary Fitch wrote:
> -----Original Message-----
> From:
> [] On Behalf Of C F
> Sent: Monday, August 29, 2011 3:18 PM
> To:; Asterisk Users Mailing List - Non-Commercial
> Discussion
> Subject: Re: [asterisk-users] Dragging the dialup customers along, possible?
> From what you are asking it appears that you are trying to run similar
> to a fax (modulation and demodulation) over VoIP.
> Try again,…

Asterisk Users 4.1 years ago 1 Answer

use dahdi for local terminal modem access?


I have some terminals that have phone lines. One of my tech had an idea of using IAXmodem or something similar to use
existing PRI/DAHDI Trucks for dial out via the asterisk/Linux console. Anybody ever heard of doing this? I would think maybe would use iaxmodem maybe and a shell terminal app? (basically I'm dialing into a remote access device that uses a pots like for
remote administration, and don't want to string a channel bank off my
asterisk box, and a hook to a modem)

Asterisk Users 4.2 years ago 2 Answers

Fax with Asterisk and T38Modem


Hi, I'm fighting with HylaFAX, Asterisk and T38Modem since some time, to get
fax2mail and mail2fax working, my SIP-provider only supports T38 and
thus using G711 with IAXModem is not an option.
I have got running mail2fax with HylaFAX+ 5.5.0, Asterisk 1.4.20 and
T38Modem 2.0.0 successfull, but I'm not able to upgrade to anything
newer than Asterisk 1.4.24. I was able to break down this problem to some changes in the chan_sip.c,
where a "improved support for T38 on initial INVITE" has been
implemented (see: I'm not sure…

Asterisk Users 4.2 years ago 0 Answers

Audiocodes MP-114 - modem dial not going through


I have an Audiocodes MP-114 and modem dial-out can not establish connection. Snooping with Wireshark I get a lot of entries like this: No. Time Source Destination Protocol Info
2934 27.221559 RTP PT=ITU-T G.711 PCMU, SSRC=0x7D08611A, Seq=7662, Time=1805957855 Frame 2934: 214 bytes on wire (1712 bits), 214 bytes captured (1712 bits)
Ethernet II, Src: AudioCod_1d:ff:7f (00:90:8f:1d:ff:7f), Dst: AsustekC_de:a6:11 (00:1d:60:de:a6:11)
Internet Protocol, Src: (, Dst: (
User Datagram Protocol, Src Port: x11 (6000), Dst Port: 12982 (12982)
Real-Time Transport Protocol Is "G.711" what I should be using for modem connection?

Asterisk Users 4.4 years ago 0 Answers

Best modem for chan_datacard


I used succesfully huawei E1550 On 24 April 2011 16:45, Dovid Bender wrote: > Hi List,
> I am looking to "play around" with chan_datacard. Any advice on the "best"
> device to test with (that I can find on eBay) ?
> Regards,
> Dovid
> --
> _____________________________________________________________________
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Asterisk Users 4.4 years ago 1 Answer

Using voice modem as poor man's FXO in Asterisk 1.8


I've tried researching this, and so far, have struggled to find any contemporary information on the issue, so I do apologize if asking this irritates people who have answered this before. I have managed to set up Asterisk 1.8 on the web server here. I have two softphones (Ekiga) able to communicate with it. So far so good. I'm now curious to see if I can link it with the PSTN phone line here. The web server in question is an Intel Atom system with a Mini-ITX motherboard

Asterisk Users 4.6 years ago 6 Answers