I have a 2811 running CME with a VIC-2FXO card installed. My code version is 12.4(4)T I have a pots line connected to the FXO card for incoming and outgoing calls, and a couple of 7960 phones. Everything works except that I have very very bad static (cracking) on all incoming and outgoing calls. I have turned vad on/off, comfort noise on/off, I have played with input gain, output gain, and impedence settings to no avail. I know it is not the pots line because I can connect a phone to the line and I get no noise at all. When making a call as soon as the call is connected the static starts (when the diplay on the phone says "Connected" the static starts.) Any ideas? This is my first posting here so if there is more info that is standard to put in that I haven't I apologize. I have googled and searched here at Cisco to try to find a solution and have found practically nothing. I have connected the phones to 4ESW card with inline power, and connected them to a 2924 using power bricks, and both are just as bad. I don't know what to try next. Any help would be appreciated.
I ran the test and it came back with complex5, which I then configured. Didn't make any difference. Setting the input gain to -6 is like turning down the volume, but the static is still really bad, and the volume is so low you can't hear the person at the end of the line. Could I have bad hardware? Also the cable for the post line from the demarc to the router is cat5 and is about 20 feet long. Could this be the problem?
Why is it -6? Usually you shouldn't have to lower it, try the default but that isn't going to solve the static problems probably.
How far are you from the CO? What part of the country?
Try using a regular old 2 wire phone line into FXO port. These are touchy about cabling at times and phone lines being used.
Others on this forum and elsewhere, have used DSL filters on phone lines to clear up issues like this and it fixed things up. I know it is out there, but may be worth trying also if you have one handy.
Sorry to tell you this I have been working on CME since the ITS days and it is not where it needs to be yet. I have it at a customer site having the same issues and same configuration except I have a inline switch module in the 2811 with 8 ports. I replaced the FXO card and the PVMD2 -16 thinking it might be the DSP resources. I have spent hours tweaking the input gain and output attenation. So I called TAC two days of troublshooting and now Cisco wants me to replace the whole chassis and everything inside. The customer is ready to kill me over 5 phone site.
PS There is a light at the end of the tunnel. Watch the Voice Con John Chambers WEB Cast on 3/8 and alot will be explained about product offerings. Since I am under NDA as a Gold Cisco Partner I can not go into details.
Hang in there I have been working on IPT and VoIP since 1998 and let me tell you this it is 1000 times better than it was then.Before that I spent 8 years working on Nortel, NEC PBX's and KSU's Cisco has the lead on the other players and is steadly pulling away.
Sorry I could not help you and went off on a tangent, but post the solution if you find one and I will let you know if the chassis replacment fixes mine.
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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 ...