From: Jennifer Joy (jjoy@xxxxxxxxxxx)
Date: Tue Jan 23 2001 - 19:50:05 GMT-3
Tim Ross said:
>
> I've been attempting Voice for the first time recently. I bought a 2611 (on
> eBay), and then bought a NM-2V and the FXS port elsewhere. I also bought a
> 1750-2V which came with the correct IOS for voice. I can dial the Pots lines
> on the 2611, but the results are terrible. The voice quality sounds like
> listening to gremlins talking to Charlie Brown's school teacher. I
> downloaded several different IOS versions( for the 2600), but the recent
> ones require 16 Meg Flash and 64 Meg DRAM. The 1750-2V sounds fine, but the
> 2600 sounds terrible. Even dialing one port to the other (local/on the 2611
> router alone). I only have 8 Flash and 32 DRAM. Is there a version someone
> can recommend that will support voice with this config? (8/32). I also have
> (2) 924's (Cisco Cable modem with 2 voice ports) and have only had mixed
> results with them. I can only get one of the ports to get a dial tone, etc.
> Any IOS recommendations for them also?
>
> Please, help me make the gremlins go away...
Hi Tim,
I described this as "invasion of the mumbling ducks" recently.
I had a problem with different version of the IOS. Whatever
version you do try, I'd keep them as close to the same as possible,
although I managed to make it work without doing that.
I was running these versions:
One router is 12.0(9) on a 2600 and the other is 12.1(6) on a 3640.
Try changing codecs. I ended up ditching the default g729r8
and using g711ulaw or g711alaw. Both of which worked fine.
You set them under the dial peer.
r11(config-dial-peer)#codec ?
g711alaw G.711 A Law 64000 bps
g711ulaw G.711 u Law 64000 bps
g729r8 G.729 8000 bps
It's important that the other router supports the codec you chose.
You can find a list by doing the dial-peer check as above.
Jennifer
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