本文主要实现 OpenWRT 系统通过 Huawei 3G Modem 加 asterisk 套件将 GSM 通话转为 SIP 通话
安装 openwrt 下的 asterisk16 套件
opkg update
opkg install asterisk16-app-system asterisk16-chan-dongle asterisk16-pjsip asterisk16-codec-ulaw asterisk16-codec-alaw asterisk16-res-rtp-asterisk asterisk16-bridge-simple
调整 PJSIP 作为默认服务，并且新增几个 PJSIP 账户，用以测试内线通
/etc/asterisk/pjsip.conf
[transport-udp]
type=transport
protocol=udp ;udp,tcp,tls,ws,wss
bind=0.0.0.0
[6003]
type=endpoint
transport=transport-udp
context=from-internal
disallow=all
allow=ulaw
auth=6003-auth
aors=6003
[6003-auth]
type=auth
auth_type=userpass
password=6003
username=6003
[6003]
type=aor
max_contacts=1
[6004]
type=endpoint
transport=transport-udp
context=from-internal
disallow=all
allow=ulaw
auth=6004-auth
aors=6004
[6004-auth]
type=auth
auth_type=userpass
password=6004
username=6004
[6004]
type=aor
max_contacts=1
新增分机拨打模板，
/etc/asterisk/extension.conf
[from-internal]
exten => _Z.,1,Dial(PJSIP/${EXTEN},60,Trg)
same => n,Hangup()
用 asterisk 查看分机状态，拨打过程中 pjsip show endpoints 中显示的状态会从 Not in use 转换为 In use
asterisk -rvvvv
OpenWrt*CLI> pjsip show contacts
Contact: <Aor/ContactUri..............................> <Hash....> <Status> <RTT(ms)..>
==========================================================================================
Contact: 6001/sip:6001@192.168.234.127:53117;transport= 378e2db08b NonQual nan
Contact: 6001/sip:6001@192.168.234.127:53117;transport= 378e2db08b NonQual nan
Contact: 6003/sip:6003@192.168.234.158:49989;transport= 2ec100f865 NonQual nan
Contact: 6003/sip:6003@192.168.234.158:49989;transport= 2ec100f865 NonQual nan
Contact: 6004/sip:6004@192.168.104.11:5060 586381001a NonQual nan
Contact: 6004/sip:6004@192.168.104.11:5060 586381001a NonQual nan
Objects found: 6
-- PJSIP/6001-00000005 is ringing
-- PJSIP/6001-00000005 is ringing
> 0x2262b00 -- Strict RTP learning after remote address set to: 192.168.234.127:52518
-- PJSIP/6001-00000005 answered PJSIP/6004-00000004
> 0x2270c60 -- Strict RTP learning after remote address set to: 192.168.104.11:11866
-- Channel PJSIP/6001-00000005 joined 'simple_bridge' basic-bridge <ee120657-8627-4868-b677-cb0d896a2b5a>
-- Channel PJSIP/6004-00000004 joined 'simple_bridge' basic-bridge <ee120657-8627-4868-b677-cb0d896a2b5a>
> 0x2262b00 -- Strict RTP switching to RTP target address 192.168.234.127:52518 as source
> 0x2270c60 -- Strict RTP switching to RTP target address 192.168.104.11:11866 as source
OpenWrt*CLI> pjsip show endpoints
Endpoint: <Endpoint/CID.....................................> <State.....> <Channels.>
I/OAuth: <AuthId/UserName...........................................................>
Aor: <Aor............................................> <MaxContact>
Contact: <Aor/ContactUri..........................> <Hash....> <Status> <RTT(ms)..>
Transport: <TransportId........> <Type> <cos> <tos> <BindAddress..................>
Identify: <Identify/Endpoint.........................................................>
Match: <criteria.........................>
Channel: <ChannelId......................................> <State.....> <Time.....>
Exten: <DialedExten...........> CLCID: <ConnectedLineCID.......>
==========================================================================================
Endpoint: 6001 In use 1 of inf
InAuth: 6001-auth/6001
Aor: 6001 1
Contact: 6001/sip:6001@192.168.234.127:53117;transp 378e2db08b NonQual nan
Transport: transport-udp udp 0 0 0.0.0.0:5060
Channel: PJSIP/6001-00000005/AppDial Up 00:00:04
Exten: CLCID: "6004" <6004>
Endpoint: 6002 Unavailable 0 of inf
InAuth: 6002-auth/6002
Aor: 6002 1
Transport: transport-udp udp 0 0 0.0.0.0:5060
Endpoint: 6003 Not in use 0 of inf
InAuth: 6003-auth/6003
Aor: 6003 1
Contact: 6003/sip:6003@192.168.234.158:49989;transp 2ec100f865 NonQual nan
Transport: transport-udp udp 0 0 0.0.0.0:5060
Endpoint: 6004 In use 1 of inf
InAuth: 6004-auth/6004
Aor: 6004 1
Contact: 6004/sip:6004@192.168.104.11:5060 586381001a NonQual nan
Transport: transport-udp udp 0 0 0.0.0.0:5060
Channel: PJSIP/6004-00000004/Dial Up 00:00:04
Exten: 6001 CLCID: "" <6001>
Objects found: 4
> 0x2270c60 -- Strict RTP learning complete - Locking on source address 192.168.104.11:11866
> 0x2262b00 -- Strict RTP learning complete - Locking on source address 192.168.234.127:52518
有条件的情况下建议可以考虑使用 IAX 分机替代 SIP 分机，这样只需要 NAT 打通一个 UDP 端口就能通话，而不用像 SIP 那样要考虑 ALG,ICE,STUN 等方案
下面是新增一个 IAX 分机的用例
opkg update
opkg install asterisk16-chan-iax2
/etc/asterisk/iax.conf
[general]
bindport=4569
bindaddr=0.0.0.0
iaxcompat=yes
nochecksums=yes
disallow=all
allow=ulaw
[6010]
type=friend
username=6010
secret=6010
context=from-internal
host=dynamic
callerid=6010<6010>
/etc/asterisk/extensions.conf
[from-internal]
exten => 6010,1,Dial(IAX2/6010,60,Trg)
由于 3G modem 还没到货，所以目前先更新到这里，等到货后继续配置。
12 月 27 号收货，继续更，用到的型号是 Huawei K3765.
K3765 3G modem
在 openwrt 下配置 dongle 设备,请结合实际数据配置
/etc/asterisk/dongle.conf
[general]
interval=20
[defaults]
context=dongle-in
group=0
exten=+862022221234
[dongle0]
imei=123451234512345
通过 asterisk 控制台查一下设备状态,
asterisk -rvvvv
RiWifi*CLI> dongle show devices
ID Group State RSSI Mode Submode Provider Name Model Firmware IMEI IMSI Number
dongle0 0 Free 16 3 3 FFFFFFFFFFFFFF K3765 11.126.03.04.521 123451234512345 123451234512345 Unknown
接下来新增呼出、呼入的分机配置
/etc/asterisk/extensions.conf
[from-internal]
exten => _1.,1,Dial(Dongle/g0/${EXTEN:1}) ;呼出设置，结合实际，我这边是加了"1"这个前缀，例如我的 SIP 分机要拨打 10011,那么拨号就是 110011
[dongle-in]
exten => +862022221234,1,Dial(IAX2/6010,60,Trg) ;呼入设置，我这边就是配置成所有呼叫直接转到 IAX-6010 分机，复杂点的可以做 IVR，号码本，不过只有一路的电话就不需要搞这么复杂了。
最后，拨号测试
呼入测试
呼出测试
refer: https://www.ppuu.org/2019/12/openwrt-asterisk-dongle-gsm-to-sip/
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