[Asterisk-Users] Re: no ring on inbound SIP calls

[Peter Svensson]

On Sun, 10 Apr 2005, Eric Wieling wrote:

> No.  "r" instructs Asterisk to provide a fake ringback tone.  If you 
> need "r" then something is seriously wrong.  Asterisk will always 
> provide rinback tones when it thinks it should.

For PRI channels you may need it if the equipment at the oher end does not 
provide in band audio. Also, Asterisk does not synthezise in band audio 
progress information when bridging pri->sip at least. This is despite 
Asterisk sending a progress message with "in band progress available". 

It seems quite normal to need "r" on internal extension (going to a pbx 
over pri or to some sip phones).

Peter