[Asterisk-Users] Random Intermittent Noise for SIP to FX0 calls plus echo

[Christopher L. Wade]

Mike Meyer wrote:
> 	The problem we are having is that every now and then, say 4 times over
> a 20 minute call, interference occurs in the ear of the SIP phone user.
> The other side (PSTN caller) of the conversation may hear a few short
> (half second) breaks in the conversation. The characteristics of the
> interference in the SIP phone user is some in-band MF tones which may
> start out faint and get louder which are broken up them selves to make a
> cracking noise. There may be some momentary echo of my voice when this
> happens also. This may last for about 3 seconds and then the
> conversation is clear.
> 
> 	We don't get this when using Analog phones on an FXS port nor for SIP
> to SIP conversations.
> 

Exact same issues here, haven't solved yet, but am slowly working on it.

Thanks,
Chris