I have some questions that the O’Reilly book didn’t quite explain:
The book says (pg 72) that IAX is better suited for NAT because it only uses 1 port for communication. My guess is that SIP on a NAT’ed network works just fine for a internal phone system that uses PSTN as its outside communication method, correct?
When setting up the client confguration in the sip.conf file, the choices for for the HOST option are STATIC, DYNAMIC, or a specific IP ADDRESS. Is explicitly specifing an IP address more secure? Will it prevent malicious activity, like spoofing? Or should I just use DYNAMIC?
When setting up channels in zapata.conf, consider the following configuration:
channel => 1
channel => 2
Will channel 1 have options 1 and 2, and channel 2 will have options 1, 2, and 3?
Is there any compatibily between ground start, loop start, and kewl start? The book seems to suggest loop start and kewl start are compatible but it doesn’t outright say it. Will I need to determine signal start type if implementing asterisk on an existing phone system?
Asterisk seems to have a lot of options utilizing MMX technology. Should I buy my motherboad/processor with MMX in mind?