Bearer capability not provided during MO call using mncc-python, which results in GSM IE error (96) invalid mandatory information sent by Network -> MS (mncc-python)

Verified this error by GSMTAP using mncc-python interface OsmocomBB to network
Proposed Changes:
In case of MO call (_onmncc_setup_req) caller needs to provide bearer_cap speech version
Added mncc.bearer_cap in mncc_sock.py based on codecs = GSM48.AllCodecs
Added new field mncc.MNCC_F_BEARER_CAP in mncc.MNCC_SETUP_REQ, when call is initiated (MO) from MS -> network

Change-Id: If77851b86111d62d82221a886ed2391179080cca
changes/41/2841/1
Gerard Pinto 6 years ago
parent ce184f83f0
commit 983231a70d
  1. 7
      gsm_call_fsm.py
  2. 12
      mncc_sock.py

@ -14,7 +14,7 @@ import ctypes
import pykka
from fysom import Fysom
from mncc_sock import mncc_msg, mncc_number, mncc_rtp_msg, mncc_bridge_msg
from mncc_sock import mncc_msg, mncc_number, mncc_rtp_msg, mncc_bridge_msg, mncc_bearer_cap
Uint32Array2 = mncc.uint32_t * 2
@ -82,9 +82,10 @@ class GsmCallFsm(pykka.ThreadingActor):
def _onmncc_setup_req(self, e):
msg = mncc_msg(msg_type = mncc.MNCC_SETUP_REQ, callref = self.callref,
fields = mncc.MNCC_F_CALLED | mncc.MNCC_F_CALLING,
fields = mncc.MNCC_F_CALLED | mncc.MNCC_F_CALLING | mncc.MNCC_F_BEARER_CAP,
calling = mncc_number(self.calling),
called = mncc_number(self.called))
called = mncc_number(self.called),
bearer_cap = mncc_bearer_cap(self.codecs_permitted))
self.mncc_ref.tell({'type': 'send', 'msg': msg})
def find_matching_codec(self, ms_codecs):

@ -52,6 +52,18 @@ def mncc_number(number, num_type = 0, num_plan = 0, num_present = 1, num_screen
plan = num_plan, present = num_present,
screen = num_screen)
def mncc_bearer_cap(codecs_permitted):
speech_ver = ctypes.c_int * 8
speech_types = speech_ver()
index = 0
for codec in codecs_permitted:
speech_types[index] = codec
index = index + 1
speech_types[index] = -1
return mncc.gsm_mncc_bearer_cap(coding = 0, speech_ctm=0, radio = 1, speech_ver = speech_types, transfer = 0, mode = 0)
class MnccSocketBase(object):
def send(self, msg):
return self.sock.sendall(msg.send())

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