I have a mostly functioan LMR setup going, using a VIC2-2E/M in a 3825. I am hoping to use this to allow phone users to link to our radio network. Unfortunately, the VOX as generated by the cisco router is at too low of a threshold, so the router keys the radio based even on minor noises. I have the system setup as a simple dial-peer and voice port, and am trying ot use the "lmr ip-vad" function. Is there a way I can set the threshold for ip-vad so that it will not key up the radio on background noise?
Here is my configuration:
lmr e-lead voice
lmr duplex half
input gain 5
output attenuation -16
no echo-cancel enable
timeouts call-disconnect 3
timeouts ptt rcv 3
timing hangover 300
threshold noise -60
dial-peer voice 16 pots
What happens is that when you dial 2505, it connects and will key up the radio when you talk, but it will aso just randomly key up the radio causing all sorts of havoc. What I am looking for is a way to modify the threshold so it takes more voice energy to key up the radio.
I've read through the documentation that you cited prior to posting the question, but I'm not sure how it helps (perhaps it does, and I'm just missing it). In the above config snippet you posted, lmr e-lead voice means that it will seize the e-lead when it receives voice packets from the network, relying on the far-end VAD to do the voice gating/VOX stuff. This is problematic since I'd lke to be able to, say, conference the radios with a remote caller as well as someone local.
The configuration directive of "lmr ip-vad" is supposed to set it up so that the DSP watches the inbound voice packets from the network, and only cause the port to seize when there is actually voice energy in those packets. The problem is that it's too sensitive. I was/am hoping there is a way to adjust these thresholds.
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