Hi. I’m having trouble figuring out why I’m not able to make many concurrent VoIP calls on my system. I’m not aiming for a huge number, because I have purposely bought a low powered system, but I would think that I could get more. Here are the details:
I have a small-form-factor Asterisk server with an Intel Atom 230 CPU (1.6 GHz, 533 MHz FSB) and 512 MB DDR2 533. It is running Ubuntu Server 9.04 with the default Debian package manager installation of Asterisk. (version 1.4)
Here is what is going on: I’m making outgoing calls (with .call files) via SIP (using Vitelity’s service, if anyone wants to know) with about 55.0 ms latency. I’m using GSM-format prompts with GSM encoding (disallow=all, allow=gsm) and I’m able to make about 7 concurrent calls. I have a very fast internet connection, so there is still plenty of bandwidth, and the “top” command shows that Asterisk is only at about 5% CPU and 10% RAM. Even with only 7 calls, a landline phone will “skip” occcasionally, but cell phones have perfect quality.
I don’t think that 7 calls is very many, I’ll be happy if I can get 10 good-sounding calls. Can anyone give suggestions? (If this has been hashed out elsewhere, I’m happy with a link to more information!)