Howto:Howto get an analog modem to work with an analog adapter: Difference between revisions
(info about V7 sync added) |
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This information applies to | This information applies to | ||
*IP21 | *IP21 V5, V6 | ||
*IP22, | *IP22 V6, V7 | ||
*IP24, | *IP24 V6, V7 | ||
*IP28, | *IP28 V6, V7 | ||
*IP302, | *IP302 V6, V7 | ||
<!-- Keywords: enter keywords, foreign translations and/or synoyms not appearing in the article here for better search results --> | <!-- Keywords: enter keywords, foreign translations and/or synoyms not appearing in the article here for better search results | ||
Frankiermaschine | |||
franking machine | |||
postage meter | |||
Modem over IP | |||
MoIP | |||
V.150 | |||
--> | |||
==More Information== | ==More Information== | ||
===Problem Details=== | ===Problem Details=== | ||
Sending Faxes over IP networks is only possible with an T.38 implementation like innovaphone uses in all Gateways. For modems there is no protocol implemented. | Sending Faxes over IP networks is only possible with an T.38 implementation like innovaphone uses in all Gateways. For modems there is no protocol implemented. The only way to get a working modem connection is to setup a media channel with no restriction or compression. | ||
===System Requirements=== | |||
To enable fax or modem connection over RTP media channel following requirements must be fulfilled: | |||
; a network connection with no packet loss : LAN is only acceptable connection for this application, WAN is usually not able to fulfil the requirement | |||
; a network connection with low delay : LAN connection and frame size of 20 ms is required | |||
; the voice data must be uncompressed : G711 codec must be used exclusive | |||
; TDM-like synchronisation between endpoints : enables stable connection over longer period of time(available in V7) | |||
===Configuration=== | ===Configuration=== | ||
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Configure codec under Gateway/Interfaces/TELx: | Configure uncompressed codec G711 and frame size of 20 ms under Gateway/Interfaces/TELx: | ||
<center>[[Image:Analog_modem_02.png]]</center> | <center>[[Image:Analog_modem_02.png]]</center> | ||
Disable the echo canceler in the appropriate routing entry. Therefore go to the routing table Gateway->Routes: | |||
<center>[[Image:Analog_modem_03.png]]</center> | <center>[[Image:Analog_modem_03.png]]</center> | ||
| Line 43: | Line 57: | ||
Please keep in mind to deactivate echo | Please keep in mind to deactivate echo canceller on whole voip path till outbreak to another analog line. | ||
In Firmware Version 7 it is possible to [[Reference7:Configuration/General/Sync|get TDM Sync from remote device via IP]]. Make sure all devices are synchronized to device connected to the device with a TDM sync source like ISDN network. | |||
===Known Problems=== | ===Known Problems=== | ||
| Line 49: | Line 67: | ||
Having still problems with Modem connections - disable faststart (no faststart) on the Gateway. | Having still problems with Modem connections - disable faststart (no faststart) on the Gateway. | ||
<!-- == Related Articles == --> | <!-- == Related Articles == --> | ||
[[Category:Howto|{{PAGENAME}}]] | [[Category:Howto|{{PAGENAME}}]] | ||
Revision as of 15:07, 10 June 2009
Analog adapters IP21/IP22/IP24/IP28/IP302 are able to work with an analog modem with some special settings.
Applies To
This information applies to
- IP21 V5, V6
- IP22 V6, V7
- IP24 V6, V7
- IP28 V6, V7
- IP302 V6, V7
More Information
Problem Details
Sending Faxes over IP networks is only possible with an T.38 implementation like innovaphone uses in all Gateways. For modems there is no protocol implemented. The only way to get a working modem connection is to setup a media channel with no restriction or compression.
System Requirements
To enable fax or modem connection over RTP media channel following requirements must be fulfilled:
- a network connection with no packet loss
- LAN is only acceptable connection for this application, WAN is usually not able to fulfil the requirement
- a network connection with low delay
- LAN connection and frame size of 20 ms is required
- the voice data must be uncompressed
- G711 codec must be used exclusive
- TDM-like synchronisation between endpoints
- enables stable connection over longer period of time(available in V7)
Configuration
Following parameters that differ from the default configuration can be changed to increase the modem functionality.
Enable passive checkbox under TELx->Signaling (don't interpret FLASH and DTMF's when connected) on your appropriate TEL Interface:
Configure uncompressed codec G711 and frame size of 20 ms under Gateway/Interfaces/TELx:
Disable the echo canceler in the appropriate routing entry. Therefore go to the routing table Gateway->Routes:
Disable Echo Canceler for routes from and to appropriate analog interface:
Please keep in mind to deactivate echo canceller on whole voip path till outbreak to another analog line.
In Firmware Version 7 it is possible to get TDM Sync from remote device via IP. Make sure all devices are synchronized to device connected to the device with a TDM sync source like ISDN network.
Known Problems
Having still problems with Modem connections - disable faststart (no faststart) on the Gateway.