Asterisk PBX

In sip.conf or sip_additional.conf:

register => [10 digit QV number]:[qv sip password]@sipdr.quantumvoice-sip.com/[10 digit QV number]

for example, if your QV number is 7345551212 and your SIP password is abcdefg:
register => 7345551212:abcdefg@sipdr.quantumvoice-sip.com/7345551212

Next we create a SIP peer:

[quantumvoice]
host=sipdr.quantumvoice-sip.com
username=[10 digit QV number]
secret=[QV SIP password]
type=friend
insecure=very      (for Asterisk 1.4 and newer, "insecure=INVITE" may be required)
fromuser=[10 digit QV number]
fromdomain=sipdr.quantumvoice-sip.com
dtmfmode=rfc2833
domain=sipdr.quantumvoice-sip.com
disallow=all
canreinvite=no
allow=ulaw
context=quantumvoice-in

For Example:
[quantumvoice]
host=sipdr.quantumvoice-sip.com
username=7345551212
secret=abcdefg
type=friend
insecure=very
fromuser=7345551212
fromdomain=sipdr.quantumvoice-sip.com
dtmfmode=rfc2833
domain=sipdr.quantumvoice-sip.com
disallow=all
canreinvite=no
allow=ulaw
context=quantumvoice-in

Here are some examples for extensions.conf

[quantumvoice-out] ; this matches all 7 or 11 digit NANPA-style US numbers and sends them to QV
exten => _1NXXNXXXXXX,1,Dial(SIP${EXTEN}@quantumvoice|300|r)
exten => _NXXXXXX,1,Dial(SIP/${EXTEN}@quantumvoice|300|r)
exten => _011.,1,Dial(SIP/${EXTEN}@quantumvoice|300|r)
exten => *123,1,Dial(SIP/${EXTEN}@quantumvoice|300|r) ; allows checking of voice mail.
exten => 911,1,Dial(SIP/911@quantumvoice|300|r) ; emergency calls


[quantumvoice-in] ; provides an incoming context for Quantumvoice
exten => s,1,Dial(SIP/1234&ZAP/2&IAX2/bob) ; dials SIP/1234 (an IP phone), ZAP/2 (an analog port) and IAX2/bob (probably a softphone. Customize this list to fit your needs.
exten => _X.,1,Goto(s,1) ; makes sure everything sent into this context goes to the above line