Gordon Henderson wrote: > On Fri, 1 Jun 2007, Gavin Henry wrote: > >> Dear all, >> >> I think this is common, or at least how it is supposed to be, but >> whening dialing over a ZAP channel, it's taking around 5~ seconds to >> ring on the over end, likewise inbound. >> >> This is just with a normal Dial command. > > It's "normal" for an analogue Zap channel.
Not exactly. Explanation follows. > Asterisk has to "sieze" the line (after a basic check to make sure the > channel is free), that may entail a delay of a second or so while it > makes sure there there is a dial-tone (actually, I'm not sure it waits > for a dial-tone) Zap does not do dial tone detection. >, then it sends the digits out via DTMF - that might > take a second or 2 for a long number - then it's up to the PSTN switch > at the other end to connect the call - depending on the technology, this > might take several seconds. This depends on multiple factors -- you can tweak your DTMF output to speed up dialing. You'll have to use some trial and error to confirm that the PSTN is receiving the DTMF properly. I have another theory, though -- are you dialing from a SIP extension? The biggest delay, in my experience, is the time it takes for the SIP extension to recognize that a full number has been dialed. It doesn't pass the number to Asterisk until it has interpreted it as a complete number. Many SIP devices let you configure this behaviour. You should also compare how long it takes to complete a call from an analog extension that is directly on the line, so that you have a baseline for reference. You will also find that many key systems introduce delay like this. In any case, this is all tweakable to make it faster. -Stephen _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
