[asterisk-users] Bad ringback tone on zap channel

[James Lamanna]

Hmm ok.
This was a call from a SIP phone registered with Asterisk outbound on
a Zap trunk.
So would Asterisk or the phone be generating the ringback tone in that case?

It also happens very intermittently (maybe 1 in 10 calls at most...)

-- James

Rob Hillis wrote:
> 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.