A few weeks ago at work we upgraded our phone system to an Asterisk based VoIP PBX. We utilized a Cisco SPA112 to provide analog connectivity for our fax machine and the NeoPost postage meter. While receiving faxes was all well and good we realized that we could not send them out nor could our postage meter dial up to the post office to purchase postage. This was due to the dial tone going to fast-busy too quickly before either device started to dial the destination number. To extend this time, there are a few values you will need to change in your SPA configuration.
Login to your SPA112 and go to the Voice tab
The default call tones allow for only 10 seconds to start dialing. Update the following tones to allow for 30 seconds:
Dial Tone: 350@-19,440@-19;30(*/0/1+2)
Second Dial Tone: 420@-19,520@-19;30(*/0/1+2)
Outside Dial Tone: 420@-19;30(*/0/1)
MWI Dial Tone: 350@-19,440@-19;2(.1/.1/1+2);30(*/0/1+2)
Cfwd Dial Tone: 350@-19,440@-19;2(.2/.2/1+2);30(*/0/1+2)
Then go to the Control Timers Values section.
Set your Interdigit Long Timer and Interdigit Short Timer to 10 seconds.
This should give your analog devices ample time to begin the dial out process.