Hello, we are setting up another system that will run either 1.2.4, the latest version of 1.2 or 1.4. We have not yet decided on the version. Anyhow, this is a higher volume system (dual processor) which will handle 30-50 simultaneous calls with 60 to 100 simultaneous channels lit up. Most calls are g711 with very little g729 and a little gsm mixed in. We have a similar system doing exactly this, quite well. With our existing system we have a single span Digium T1 card installed, which we never ended up using. Nice it is in there though because Asterisk uses it for timing. The new system will be pure IP with no need for Analog or T1 circuits. Questions are: 1- Can I really get away with using ZT Dummy on a high volume system like this and put no card in? 2- If I can, should I even risk it or just put a card in? 3- I obviously don't want to put a $500 T1 card in but I do have a Digium Analog card with 2 FXO modules. I also have some clone cards. The question is, should I use the clone cards and will they work reliably just for timing. OR should I use the Digium card? 4- If I use the Digium card in, do I need to also waste a module or can I just put the bare card in with no modules since it's just for timing? Thanks for any help, I will be moving forward today more than likely and thought I would get a little advice from the list first.
Tzafrir Cohen
2007-Feb-28 10:10 UTC
[asterisk-users] Timing, use analog card, ZT Dummy etc.
On Wed, Feb 28, 2007 at 10:00:10AM -0600, voiplist wrote:> Hello, we are setting up another system that will run either 1.2.4, > the latest version of 1.2 or 1.4. We have not yet decided on the > version. > > Anyhow, this is a higher volume system (dual processor) which will > handle 30-50 simultaneous calls with 60 to 100 simultaneous channels > lit up. Most calls are g711 with very little g729 and a little gsm > mixed in. > > We have a similar system doing exactly this, quite well. > > With our existing system we have a single span Digium T1 card > installed, which we never ended up using. Nice it is in there though > because Asterisk uses it for timing. > > The new system will be pure IP with no need for Analog or T1 circuits. > > Questions are: > > 1- Can I really get away with using ZT Dummy on a high volume system > like this and put no card in?Currently A zaptel hardware source is more accurate than ztdummy, AFAIK. But I don't have any good data on this. Note that you don't have to have any channel defined in zapata.conf for a card to be used as a zaptel timing source: just load the module and probably a proper /etc/zaptel.conf that claims that this is a span that does not use external timing.> > 2- If I can, should I even risk it or just put a card in? > > 3- I obviously don't want to put a $500 T1 card in but I do have a > Digium Analog card with 2 FXO modules. I also have some clone cards. > The question is, should I use the clone cards and will they work > reliably just for timing. OR should I use the Digium card?AFAIK, a 10$ X100P from eBay will be just as good for this purpose (timing only!). Maybe also a HFC ISDN card using ZapBRI (again: you only need the zaptel patch of bristuff, which is small and simple, not all of the huge bristuffed asterisk / libpri) or mISDN and the external zaptel timing source patch.> > 4- If I use the Digium card in, do I need to also waste a module or > can I just put the bare card in with no modules since it's just for > timing?Haven't tested it. -- Tzafrir Cohen icq#16849755 jabber:tzafrir@jabber.org +972-50-7952406 mailto:tzafrir.cohen@xorcom.com http://www.xorcom.com iax:guest@local.xorcom.com/tzafrir