Hello

I've been using the latest code from git in order to use the voice features, the problem is that when I hangup an incoming call, I lose the bearer services.
Using the secondary serial port and sending a manual AT+CHUP command the bearer services never stop working, but when invoking the hangup method from the Voice interface a disconnection happens as can be seen in the following message.

Jun 20 09:35:03 vnd-de411e0c ModemManager[24886]: <debug> [1466415303.064710] [mm-base-bearer.c:874] mm_base_bearer_disconnect(): Disconnecting bearer '/org/freedesktop/ModemManager1/Bearer/1'


---- Log -----
Jun 20 09:34:57 vnd-de411e0c ModemManager[24886]: <debug> [1466415297.034554] [mm-iface-modem.c:1204] update_signal_quality(): Modem /org/freedesktop/ModemManager1/Modem/1: signal quality updated (64)
Jun 20 09:34:57 vnd-de411e0c ModemManager[24886]: <debug> [1466415297.035141] [mm-port-serial-at.c:459] debug_log(): (ttyUSB2): <-- '<CR><LF>^HCSQ: "WCDMA",56,48,49<CR><LF>'
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.778963] [mm-port-serial-at.c:459] debug_log(): (ttyUSB2): <-- '<CR><LF>+CRING: VOICE<CR><LF><CR><LF>+CLIP: "XXXXXXX",129,,,,0<CR><LF>'
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.780099] [mm-broadband-modem.c:6462] cring_received(): Ringing (VOICE)
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.780335] [mm-iface-modem-voice.c:63] mm_iface_modem_voice_create_incoming_call(): Incoming call does not exist; create it
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.788920] [mm-iface-modem-voice.c:74] mm_iface_modem_voice_create_incoming_call(): New call exported to DBus
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.789179] [mm-iface-modem-voice.c:499] call_added(): Added CALL at '/org/freedesktop/ModemManager1/Call/0'
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.808390] [mm-iface-modem-voice.c:77] mm_iface_modem_voice_create_incoming_call(): Call added to the list
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.808824] [mm-broadband-modem.c:6485] clip_received(): Caller ID received: number 'XXXXXXXX', type '129', validity '0'
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.809781] [mm-port-serial-at.c:459] debug_log(): (ttyUSB0): <-- '<CR><LF>+CRING: VOICE<CR><LF><CR><LF>+CLIP: "XXXXXXX",129,,,,0<CR><LF>'
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.810560] [mm-broadband-modem.c:6462] cring_received(): Ringing (VOICE)
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.810985] [mm-broadband-modem.c:6485] clip_received(): Caller ID received: number 'XXXXXXXX', type '129', validity '0'
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.947954] [mm-port-serial.c:1288] mm_port_serial_open(): (ttyUSB0) device open count is 2 (open)
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.953349] [mm-port-serial-at.c:459] debug_log(): (ttyUSB0): --> 'AT+CHUP<CR>'
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.968380] [mm-port-serial-at.c:459] debug_log(): (ttyUSB0): <-- '<CR><LF>OK<CR><LF>'
Jun 20 09:35:00 vnd-de411e0c ModemManager[24886]: <debug> [1466415300.981014] [mm-port-serial.c:1345] _close_internal(): (ttyUSB0) device open count is 1 (close)
Jun 20 09:35:01 vnd-de411e0c ModemManager[24886]: <debug> [1466415301.754567] [mm-port-serial-at.c:459] debug_log(): (ttyUSB2): <-- '<CR><LF>^CEND: 1,0,102,17<CR><LF>'
Jun 20 09:35:01 vnd-de411e0c ModemManager[24886]: <debug> [1466415301.755471] [huawei/mm-broadband-modem-huawei.c:2941] huawei_voice_call_end(): [^CEND] Call '1' terminated with status '102' and cause '17'. Duration of call '0'
Jun 20 09:35:01 vnd-de411e0c ModemManager[24886]: <debug> [1466415301.755804] [mm-iface-modem-voice.c:190] mm_iface_modem_voice_network_hangup(): No call to hangup
Jun 20 09:35:01 vnd-de411e0c ModemManager[24886]: <debug> [1466415301.759296] [mm-port-serial-at.c:459] debug_log(): (ttyUSB0): <-- '<CR><LF>^CEND: 1,0,102,17<CR><LF>'
Jun 20 09:35:01 vnd-de411e0c ModemManager[24886]: <debug> [1466415301.760189] [huawei/mm-broadband-modem-huawei.c:2941] huawei_voice_call_end(): [^CEND] Call '1' terminated with status '102' and cause '17'. Duration of call '0'
Jun 20 09:35:01 vnd-de411e0c ModemManager[24886]: <debug> [1466415301.760464] [mm-iface-modem-voice.c:190] mm_iface_modem_voice_network_hangup(): No call to hangup
Jun 20 09:35:03 vnd-de411e0c ModemManager[24886]: <debug> [1466415303.064710] [mm-base-bearer.c:874] mm_base_bearer_disconnect(): Disconnecting bearer '/org/freedesktop/ModemManager1/Bearer/1'
Jun 20 09:35:03 vnd-de411e0c ModemManager[24886]: <info>  [1466415303.067604] [mm-iface-modem.c:1431] __iface_modem_update_state_internal(): Modem /org/freedesktop/ModemManager1/Modem/1: state changed (connected -> disconnecting)
Jun 20 09:35:03 vnd-de411e0c ModemManager[24886]: <warn>  [1466415303.084946] [huawei/mm-broadband-modem-huawei.c:2199] mm_broadband_modem_huawei_peek_port_at_for_data(): Couldn't find associated cdc-wdm port for 'net/eth1'
Jun 20 09:35:03 vnd-de411e0c ModemManager[24886]: <debug> [1466415303.091546] [mm-port-serial.c:1288] mm_port_serial_open(): (ttyUSB0) device open count is 2 (open)
Jun 20 09:35:03 vnd-de411e0c ModemManager[24886]: <debug> [1466415303.092506] [mm-port-serial-at.c:459] debug_log(): (ttyUSB0): --> 'AT^NDISDUP=1,0<CR>'
Jun 20 09:35:03 vnd-de411e0c ModemManager[24886]: <debug> [1466415303.120181] [mm-port-serial-at.c:459] debug_log(): (ttyUSB0): <-- '<CR><LF>OK<CR><LF>'
Jun 20 09:35:03 vnd-de411e0c ModemManager[24886]: <debug> [1466415303.121103] [mm-port-serial.c:1288] mm_port_serial_open(): (ttyUSB0) device open count is 3 (open)