Simultaneous calls on one sip account

Asterisk Asterisk Support
1

I have a Grandstream GXP280 sip telephone, which supports 1 SIP account. It is said that it supports two lines though, so one should be able to switch between calls on the same SIP account.

I tried this by calling to our DID, and picking up with the phone. Then I tried dialing the extension with an other phone inside the network. This gives me the busy tone though.

In my sip.conf I added busylevel and call-limit to the template of the receiving phone. This didn’t seem to help though.

[stumpel-zwaag](!)                              ; create template for our devices
type=friend                                     ; the channel driver will mathc on username first, IP second
context=StumpelZwaag                            ; this is where calls from the device will enter the dialplan
host=dynamic                                    ; the device will register with asterisk
;nat=yes                                                ; assume the device is behind nat
secret=x                              ; a secure password for this device
dtmfmode=auto                                   ; accept touch-tones from devices, negotiated automatically
disallow=all                                    ; reset with voice codecs to accept from, and request to, the device
allow=alaw                                      ; which audio codecs we accept from
allow=g722
busylevel=2                                     ; twee inkomende gesprekken
call-limit=2

Any idea’s?

2

Although i dont know this phone exactly, I do know that not all phones enable “call waiting” by default. Its possible that the phone is sending back a busy here.

See what the asterisk CLI has to say, it should be easy enough to see. At the command line:

This will run the CLI (command Line Interface), showing the progress of all the calls and responses.

3

You will need some v’s as well, or to explicitly set the verbosity, somewhere.

Unless something has changed recently, simple Asterisk configurations will offer any number of parallel calls to a phone.