Jean-Marc V. Liotier
2004-Feb-16 06:39 UTC
[Asterisk-Users] Analogical FXO vs. BRI dialing speed
When dialing out, will a call be established significantly faster by an ISDN adapter such as an Eicon Diva server compared to an analogical FXO such as Digium's X100P ? -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part Url : http://lists.digium.com/pipermail/asterisk-users/attachments/20040216/a3197897/attachment.pgp
Klaus-Peter Junghanns
2004-Feb-16 07:23 UTC
[Asterisk-Users] Analogical FXO vs. BRI dialing speed
Am Mo, 2004-02-16 um 14.39 schrieb Jean-Marc V. Liotier:> When dialing out, will a call be established significantly faster by an > ISDN adapter such as an Eicon Diva server compared to an analogical FXO > such as Digium's X100P ?Yes, ISDN uses digital signalling so call setup times on the last mile (from your NT1 to the telco switch) are close to 0. Also the callerID on incoming calls is available immediately with ISDN (with analog lines you usually get it after the first ring). best regards Klaus -- Klaus-Peter Junghanns CEO, CTO Junghanns.NET GmbH Breite Stra?e 13 - 12167 Berlin - Germany fon: (de) +49 30 79705390 fon: (uk) +44 870 1244692 fax: (de) +49 30 79705391 iaxtel: 1-700-157-8753 http://www.Junghanns.NET/asterisk/
Steven Critchfield
2004-Feb-16 12:27 UTC
[Asterisk-Users] Analogical FXO vs. BRI dialing speed
On Mon, 2004-02-16 at 07:39, Jean-Marc V. Liotier wrote:> When dialing out, will a call be established significantly faster by an > ISDN adapter such as an Eicon Diva server compared to an analogical FXO > such as Digium's X100P ?Analog, nothing logical there. ISDN will be faster dialing out as you will communicate with asterisk via the dialpad where you want to be connected too, and if you are on a analog line, asterisk will repeat the digits to the telco switch in analog just like you did but at a specific cadence. Since a DTMF digit is around 450 to 800 msec, and in that time frame you can transfer all the call setup information digitally, the call could be setup in the equivalent of a single digits time, let alone the next 6-10 digits. Incoming, the calls are again signaled digitally and acknowledged with the switch in less time than it takes to make the first half of a ring. On analog you will want to wait till the second or third ring to get the CallerID, but it was there to start with on the ISDN call. On my PRI line, calls are answered and prompts played without a single ring event being heard by the caller. -- Steven Critchfield <critch@basesys.com>