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Questions tagged [modem]

This tag is for questions about a network interface for analog lines such as “56k” or DSL on phone lines, as well as for mobile network data service clients.

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205 questions
17
votes
5 answers

How to send AT commands to a modem in Linux?

In Linux (Ubuntu) I am trying to send AT commands to a modem at /dev/ttyACM0. I tried to do it as: sudo socat - /dev/ttyACM0 but when typing anything I just get a line repeating this command (I expect an OK). When I do sudo minicom modem1 it…
Alex
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17
votes
2 answers

Difference between ppp0 vs wwan0

I am Running Raspian on a RaspberryPi. When I plug in a GSM modem I see two interfaces - wwan0 & ppp0. wwan0 exists even when the GSM modem is plugged but not connected ppp0 exists only when the GSM modem is connected Questions What is the…
OneGuyInDc
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14
votes
3 answers

configure gsm connection using nmcli

I have a system without X display and I want to use nmcli to configure my cell modem to connect to a certain apn. I can get it going with this modem just fine on Ubuntu (with X) and I would like to achieve the same now on the command line. How can I…
stdcerr
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12
votes
5 answers

Is there a way for linux to pick up the phone?

I know that there is a way to make Linux dial out using a modem. Is there a way to program Linux (using a library/device) to pick up the modem (record phone calls) etc? see caller id?
user13728
9
votes
4 answers

Linux-compatible 56k modem

I have a client who wants to set up a fax server in their office. I'd like to use HylaFAX under Ubuntu, but I'm a little shy to spend money on hardware for Linux, particularly a modem given the whole Winmodem issue. So to ask two different questions…
Annika Backstrom
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8
votes
1 answer

Reading SIM data via file managers using USB datamodem

How to browse a GSM SIM card's filesystem in Linux / nautilus / pcmanfm filemanager, and read the files with suitable editors ? There is one related post: Howto read SMS stored on a SIM card? But this is related to reading the card via mobiles and…
Rajibando
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8
votes
2 answers

Difference between PPP, QMI and AT commands

During the past 6 days, I had the chance to interact with an LTE modem (https://sixfab.com/product/quectel-ec25-mini-pcle-4glte-module/), I managed to set up 4G Internet access on a Raspberry Pi using "QMI". But I still have A LOT of questions, I…
Tor Tor
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8
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1 answer

How to get audio in and out of Huawei GSM modems when doing a voice call?

I have a Huawei E160E and a Huawei K3765 "GSM"-modem. The question is: How to send and receive audio data placing or receiving phone/ voice calls with those modems? Both seem to support voice calls, according to specifications (E160E, K3765) and…
Golar Ramblar
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7
votes
2 answers

Find out what /dev/cuaU maps to?

I have an USB 3G modem (Huawei E353-u2) on pfSense 2.0.2 (which is based on FreeBSD 8.1-RELEASE-p13), it seems to create 2 /dev/cuaU devices: /dev/cuaU0.0 /dev/cuaU0.3 1) Why are there 2 devices? Is one of them maybe the usb mass storage of the…
stefan.at.kotlin
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7
votes
5 answers

Huawei E3372s + Linux (Rasbian), Incoming connections problem

I have a Linux-based OS (Rasbian) running on Raspberry Pi 2+ and it is using Huawei E3372s 4G/LTE USB Stick for internet connection. All my outbound connections work perfectly (Huawei USB mode changed using usb_modeswitch-ruling and Udev/rules.d)…
Janne Honkonen
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6
votes
3 answers

Detection of USB Modem is unstable - how can I correct this?

I am using Huawei 3G USB Modem in Ubuntu 12.04 LTS on DELL Inspiron NS5520. I tried every possible solution but had no luck. Whenever my USB Modem disconnects, I can not re-connect it and then I have to restart laptop. On restart, sometimes it…
FishEye
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6
votes
2 answers

Why root user is not getting "Device or resource busy" response?

I am working with GSM modem and using /dev/ttyUSB2 device. Device is having proper rights: $ ls -alh /dev/ttyUSB2 crw-rw---- 1 root dialout 188, 2 May 25 19:44 /dev/ttyUSB2 I am in dialout group and I can send AT command to this modem only once.…
DevilaN
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6
votes
3 answers

GSM modem does not create /dev/ttyUSB file

I installed Kannel in a server, and I want to use a GSM 3G USB modem to send/receive SMS messages, as described in section SMS Centers > GSM Modem of the Kannel User Guide. I have already installed, configured and tested Kannel on my…
Lucas Teixeira
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6
votes
2 answers

Restart a specific reverse ssh tunnel?

I have multiple machines in the wild that open reverse ssh connections to my server. Each machine out there is using a different reverse ssh port, which I use to differentiate between the machines. I use these tunnels to log into the machines from…
Christian
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6
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2 answers

Why does my USB modem produce multiple /dev/ttyUSB* files?

I have a single Sierra Wireless USB 308 modem we are using for sending SMS message to, and receiving SMS messages from, customers. When this single device is plugged in, the system creates multiple device files: /dev/ttyUSB0, /dev/ttyUSB1,…
Magnus
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