I have a VG248 connecting a modem to which a postage meter is connected. It works fine through a copper PSTN line. Call connects but you just hear the negotiation tone until the call drops. Traces from the VG248 indicate that it is not detecting the answer tone. Any suggestions on what to look for here?
The only things I can think of to check are the passthrough settings on the VG248. Check the settings under Configure > Telephony > Advanced. Passthrough signaling should be set for legacy. Passthrough codec should be G.711-u-law. Those should be the default settings and they work for all our modems for credit card readers, postage meters, ATMs etc.
Here are a couple of docs to add to Chris's good post. Also, make sure the VG is running the latest version (1.3(1));
Improved Fax and Modem Handling Version 1.3.(1)
Many updates have been added to improve fax and modem handling on the VG248. These updates enhance the compatibility of the VG248 with other Cisco and third-party devices.
Previously, you could enable Cisco fax relay on a per port basis. Now, you can also:
Enable Error Correction Mode
Enable Non-standard facilities (NSF)
Modify the fax pass-through signalling
Change the Cisco fax relay payload size
Modify Cisco fax relay speed
Modify the Cisco fax relay playout delay
Some of these options are configured on a per port basis while others are configured for the device. For additional information about using these new fax options with the VG248, refer to the "Configuring Fax and Modem Settings" section of the Cisco VG248 Analog Phone Gateway Software Configuration Guide:
Configuring Fax and Modem Settings
From this VG248 Admin doc (VG248 Software Configuration Guide v1.3);
Just wanted to add this bug that I came across today;
Certain modem calls may fail if fax relay is enabled.
Certain modems, when connected to the VG248, send signals during operation that the VG248 detects as fax tones. If the VG248 is configured with Cisco fax relay enabled and the Cisco fax relay negotiation between the VG248 and the remote party is successful, a Cisco fax relay connection initiates between the two endpoints. However, this Cisco fax relay connection is not suitable for general modem traffic, and the modem call fails soon after it has been established.
The workaround for this problem is to disable the use of Cisco fax relay and to rely on fax pass through instead.
I have (4) VG248s running and so far so good. My biggest problem is the amphenol connection. I think my cabling vendor who installed my cables got some cheap amphenol connectors. We have them about as tight as you can make them on the vg248, but for whatever reason, they are not making good contact. You have give them a little nudge, then 24 ports start working.... it's annoying. We are having them replaced... but word to the wise, if you these cabled by a vendor, have them find the best you can.....
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
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