[Asterisk-Users] callprogress option

[Eric Wieling]

Shaun Tierney wrote:

>>From what I've been reading about the callprogress option, it seems like it
> will work properly only with a T1 or PRI in the US.  Is that correct or are
> there still issues with call progress detection even if those qualifications
> are met?

If you ask me it doesnt' work well nomatter what kind of line you have.

VoIP (IAX/SIP/H323), PRI, and T-1/E-1 do not need callprogress.  The 
telco provides everything required for progress detection.  Analog 
ports don't (usually) provide this and so callprogress is needed.