78 lines
2.4 KiB
Python
Executable File
78 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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SPDX-License-Identifier: AGPL-3.0-or-later
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Copyright 2019 sysmocom s.f.m.c GmbH <info@sysmocom.de>
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This is a freeswitch dialplan implementation, see:
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https://freeswitch.org/confluence/display/FREESWITCH/mod_python
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Find the right SIP server with mslookup (depending on the destination number)
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and bridge calls accordingly.
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"""
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import json
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import subprocess
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def query_mslookup(service_type, id, id_type='msisdn'):
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query_str = '%s.%s.%s' % (service_type, id, id_type)
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print('[dialplan-dgsm] mslookup: ' + query_str)
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result_line = subprocess.check_output([
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'osmo-mslookup-client', query_str, '-f', 'json'])
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if isinstance(result_line, bytes):
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result_line = result_line.decode('ascii')
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print('[dialplan-dgsm] mslookup result: ' + result_line)
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return json.loads(result_line)
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def handler(session, args):
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""" Handle calls: bridge to the SIP server found with mslookup. """
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print('[dialplan-dgsm] call handler')
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msisdn = session.getVariable('destination_number')
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# Run osmo-mslookup-client binary. We have also tried to directly call the
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# C functions with ctypes but this has lead to hard-to-debug segfaults.
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try:
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result = query_mslookup("sip.voice", msisdn)
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# This example only makes use of IPv4
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if not result['v4']:
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print('[dialplan-dgsm] no IPv4 result from mslookup')
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session.hangup('UNALLOCATED_NUMBER')
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return
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sip_ip, sip_port = result['v4']
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dial_str = 'sofia/internal/sip:{}@{}:{}'.format(
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msisdn, sip_ip, sip_port)
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print('[dialplan-dgsm] dial_str: ' + str(dial_str))
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session.execute('bridge', dial_str)
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except:
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print('[dialplan-dgsm]: exception during call handler')
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session.hangup('UNALLOCATED_NUMBER')
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def fsapi(session, stream, env, args):
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""" Freeswitch refuses to load the module without this. """
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stream.write(env.serialize())
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def main():
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import argparse
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parser = argparse.ArgumentParser()
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parser.add_argument('id', type=int)
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parser.add_argument('-i', '--id-type', default='msisdn',
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help='default: "msisdn"')
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parser.add_argument('-s', '--service', default='sip.voice',
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help='default: "sip.voice"')
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args = parser.parse_args()
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result = query_mslookup(args.service, args.id, args.id_type)
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print(json.dumps(result))
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if __name__ == '__main__':
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main()
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