[asterisk-users] Bad ringback tone on zap channel

[Rob Hillis]

In my experience, the ringback you get over a zap channel (be it 
analogue or digital) is generated by the remote end, /not/ Zaptel.

The ringback you get over a SIP or IAX2 channel is often generated by 
either Asterisk or the SIP/IAX2 device you're calling from.


James Lamanna wrote:
> Hi,
> I've noticed that sometimes instead of getting a regular ring tone
> when calling out on a Zap channel, I get this obnoxious loud noise
> which forces me to hang up.
> Is this a problem in the Zaptel driver? I seem to recall that ringback
> tones are generated by zaptel when dialing out from a SIP phone over a
> Zap trunk.
>
> Thanks.
>
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