Your Python SIP "Hello World!" Application

I'm not sure how one is supposed to make a SIP "Hello World!" application, but anyway here it is, a simple application to make call to a destination.

Simple Caller Application

This application will make call to a destination URI specified in the command line argument, and establish audio communication with remote party once the call is connected.

import sys
import pjsua as pj

# Logging callback
def log_cb(level, str, len):
    print str,

# Callback to receive events from Call
class MyCallCallback(pj.CallCallback):
    def __init__(self, call=None):
        pj.CallCallback.__init__(self, call)

    # Notification when call state has changed
    def on_state(self):
        print "Call is ", self.call.info().state_text,
        print "last code =", self.call.info().last_code, 
        print "(" + self.call.info().last_reason + ")"
        
    # Notification when call's media state has changed.
    def on_media_state(self):
        global lib
        if self.call.info().media_state == pj.MediaState.ACTIVE:
            # Connect the call to sound device
            call_slot = self.call.info().conf_slot
            lib.conf_connect(call_slot, 0)
            lib.conf_connect(0, call_slot)
            print "Hello world, I can talk!"


# Check command line argument
if len(sys.argv) != 2:
    print "Usage: simplecall.py <dst-URI>"
    sys.exit(1)

try:
    # Create library instance
    lib = pj.Lib()

    # Init library with default config
    lib.init(log_cfg = pj.LogConfig(level=3, callback=log_cb))

    # Create UDP transport which listens to any available port
    transport = lib.create_transport(pj.TransportType.UDP)
    
    # Start the library
    lib.start()

    # Create local/user-less account
    acc = lib.create_account_for_transport(transport)

    # Make call
    call = acc.make_call(sys.argv[1], MyCallCallback())

    # Wait for ENTER before quitting
    print "Press <ENTER> to quit"
    input = sys.stdin.readline().rstrip("\r\n")

    # We're done, shutdown the library
    lib.destroy()
    lib = None

except pj.Error, e:
    print "Exception: " + str(e)
    lib.destroy()
    lib = None
    sys.exit(1)

Save the snippet above as simplecall.py.

Now you can call another softphone (such as ​pjsua) by specifying the SIP URI as command line argument. For example, if the other softphone is on "sip:192.168.0.15:5080", run the program as follows:

 python simplecall.py sip:192.168.0.15:5080

Here's the output of the program when I run it on Windows XP:

 13:05:25.718 os_core_win32. pjlib 0.9.0-trunk for win32 initialized
 13:05:25.718 sip_endpoint.c Creating endpoint instance...
 13:05:25.718          pjlib WinNT IOCP I/O Queue created (00D230A0)
 13:05:25.734 sip_endpoint.c Module "mod-msg-print" registered
 13:05:25.734 sip_transport. Transport manager created.
 13:05:25.968   pjsua_core.c pjsua version 0.9.0-trunk for win32 initialized
Call is  CALLING last code = 0 ()
Press <ENTER> to quit
Call is  EARLY last code = 180 (Ringing)
Call is  CONNECTING last code = 200 (OK)
Hello world, I can talk!
Call is  CONFIRMED last code = 200 (OK)
Call is  DISCONNCTD last code = 200 (Normal call clearing)