cellular-infrastructure
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mncc-python
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gsm_call_fsm: Implement classic MNCC_BRIDGE mode 

In the classic MNCC_BRIDGE mode we ask the MSC to bridge the two
traffic channels itself.  This works for E1 as well as for RTP
BTSs', and even accross mixed E1 and RTP environments.
This commit is contained in:
Harald Welte 2015-12-03 15:43:02 +01:00
parent 8ebb6355ef
commit a5fce60121
1 changed files with 20 additions and 3 deletions
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23
gsm_call_fsm.py
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@ -14,7 +14,9 @@ import ctypes
import pykka
from fysom import Fysom
from mncc_sock import mncc_msg, mncc_number, mncc_rtp_msg
from mncc_sock import mncc_msg, mncc_number, mncc_rtp_msg, mncc_bridge_msg
Uint32Array2 = mncc.uint32_t * 2
class GsmCallFsm(pykka.ThreadingActor):
last_callref = 0
@ -35,6 +37,13 @@ class GsmCallFsm(pykka.ThreadingActor):
called = mncc_number(self.called))
self.mncc_ref.tell({'type': 'send', 'msg': msg})
def _onmncc_call_conf_ind(self, e):
msg_in = e.args[0]
for i in msg_in.bearer_cap.speech_ver:
print 'SPV: 0x%02x' % i,
msg = mncc_msg(msg_type = mncc.MNCC_LCHAN_MODIFY, callref = msg_in.callref, lchan_mode = 1)
self.mncc_ref.tell({'type': 'send', 'msg': msg})
def _onmncc_setup_cnf(self, e):
# send MNCC_SETUP_COMPL_REQ to MNCC interface, causing
# CC-CONNECT-ACK to be sent to MS
@ -106,6 +115,7 @@ class GsmCallFsm(pykka.ThreadingActor):
('mncc_rel_cnf', 'RELEASE_REQUEST', 'NULL'),
],
callbacks = [('onmncc_setup_req', self._onmncc_setup_req),
('onmncc_call_conf_ind', self._onmncc_call_conf_ind),
('onmncc_setup_cnf', self._onmncc_setup_cnf),
('onmncc_disc_ind', self._onmncc_disc_ind),
('onenterNULL', self._onenter_NULL),
@ -249,14 +259,21 @@ class GsmCallConnector(pykka.ThreadingActor):
self.call_a.tell({'type':'connect_rtp', 'rtp':self.rtp_b})
self.call_b.tell({'type':'connect_rtp', 'rtp':self.rtp_a})
def bridge_legs(self):
# bridge the voice channels of both call legs in the classic way
if self.rtp_bridge:
raise Exception('GsmCallConnector', 'bridge_legs but in RTP bridge mode')
msg = mncc_bridge_msg(msg_type = mncc.MNCC_BRIDGE, callref = Uint32Array2(self.callref_a, self.callref_b))
self.mncc_act.tell({'type': 'send', 'msg': msg})
def call_state_change(self, msisdn, old_state, new_state):
print 'CallConnector:leg_state_change(%s) %s -> %s' % (msisdn, old_state, new_state)
if msisdn == self.msisdn_a: # A->B leg
self.state_a = new_state
elif msisdn == self.msisdn_b: # B->A leg
self.state_b = new_state
#if self.rtp_bridge == False and self.state_a == 'ACTIVE' and self.state_b == 'ACTIVE':
# self.connect_legs()
if self.rtp_bridge == False and self.state_a == 'ACTIVE' and self.state_b == 'ACTIVE':
self.bridge_legs()
def on_receive(self, message):
if message['type'] == 'call_state_change':