Android imsdroid到PSTN的呼叫不起作用

Question

我正在使用FreeSWITCH服务器，并与twilio SIP turnk集成。我正在使用android imsdroid应用程序进行sip呼叫。正在进行imsdroid到imsdroid的调用。imsdroid到PSTN no (即手机号码)的呼叫不工作。网关超时错误显示在imsdroid中。INVITE被发送到FreeSWITCH，freeswitch服务器将呼叫路由到Twilio。但是没有收到任何响应。可能的问题是什么。

IP是allowed.From SIPML5客户端到PSTN的呼叫正在工作。下面是来自FreeSWITCH的邀请

INVITE sip:+919986790176@nowconf.pstn.twilio.com SIP/2.0
Via: SIP/2.0/UDP 220.227.38.107:5080;rport;branch=z9hG4bK5yt865UUKDF4H
Max-Forwards: 69
From: "+919845217138" <sip:FreeSWITCH@nowconf.pstn.twilio.com>;tag=eFNKtBae4HN1r
To: <sip:+919986790176@nowconf.pstn.twilio.com>
Call-ID: 06f7df5f-1f81-1235-67b0-2e81eca04f81
CSeq: 98923179 INVITE
Contact: <sip:gw+Twilio-outbound@220.227.38.107:5080;transport=udp;gw=Twilio-outbound>
User-Agent: FreeSWITCH-mod_sofia/1.6.10+git~20160824T215404Z~726448d962~64bit
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 248
P-Preferred-Service: urn:urn-7:3gpp-service.ims.icsi.mmtel
P-Access-Network-Info: ADSL;utran-cell-id-3gpp=00000000
X-FS-Support: update_display,send_info
Remote-Party-ID: "+919845217138" <sip:+919845217138@nowconf.pstn.twilio.com>;party=calling;screen=yes;privacy=off

v=0
o=FreeSWITCH 1478495490 1478495491 IN IP4 220.227.38.107
s=FreeSWITCH
c=IN IP4 220.227.38.107
t=0 0
m=audio 22996 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20

SIPML5邀请

INVITE sip:+919742164769@nowconf.pstn.twilio.com SIP/2.0
Via: SIP/2.0/UDP 220.227.38.107:5080;rport;branch=z9hG4bKD5jv3tcpNtFDS
Max-Forwards: 69
From: "+919845217138" <sip:FreeSWITCH@nowconf.pstn.twilio.com>;tag=cvS8XKDp62Z5e
To: <sip:+919742164769@nowconf.pstn.twilio.com>
Call-ID: 69171aa5-1d0d-1235-67b0-2e81eca04f81
CSeq: 98788399 INVITE
Contact: <sip:gw+Twilio-outbound@220.227.38.107:5080;transport=udp;gw=Twilio-outbound>
User-Agent: FreeSWITCH-mod_sofia/1.6.10+git~20160824T215404Z~726448d962~64bit
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 488
X-FS-Support: update_display,send_info
Remote-Party-ID: "+919845217138" <sip:+919845217138@nowconf.pstn.twilio.com>;party=calling;screen=yes;privacy=off

v=0
o=FreeSWITCH 1478224523 1478224524 IN IP4 220.227.38.107
s=FreeSWITCH
c=IN IP4 220.227.38.107
t=0 0
m=audio 24404 RTP/AVP 102 9 0 8 103 101
a=rtpmap:102 opus/48000/2
a=fmtp:102 useinbandfec=0; cbr=1; maxaveragebitrate=30000; maxplaybackrate=48000; ptime=20; minptime=10; maxptime=40; stereo=1
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:103 telephone-event/48000
a=fmtp:103 0-16
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
ACK sip:172.18.22.113:5060 SIP/2.0
Via: SIP/2.0/UDP 220.227.38.107:5080;rport;branch=z9hG4bKeecN5NXSj35Zm
Route: <sip:54.172.60.3:5060;lr;ftag=cvS8XKDp62Z5e>
Max-Forwards: 70
From: "+919845217138" <sip:FreeSWITCH@nowconf.pstn.twilio.com>;tag=cvS8XKDp62Z5e
To: <sip:+919742164769@nowconf.pstn.twilio.com>;tag=70832428_6772d868_27e46324-e125-4895-a6ff-98031cdb43fc
Call-ID: 69171aa5-1d0d-1235-67b0-2e81eca04f81
CSeq: 98788399 ACK
Contact: <sip:gw+Twilio-outbound@220.227.38.107:5080;transport=udp;gw=Twilio-outbound>
Content-Length: 0

SIP/2.0 200 OK
Via: SIP/2.0/UDP 54.172.60.3:5060;branch=z9hG4bK763a.52f422d4.0
Via: SIP/2.0/UDP 172.18.22.113:5060;rport=5060;received=54.172.61.235;branch=z9hG4bK27e46324-e125-4895-a6ff-98031cdb43fc_6772d868_294770755291215
From: <sip:+919742164769@nowconf.pstn.twilio.com>;tag=70832428_6772d868_27e46324-e125-4895-a6ff-98031cdb43fc
To: "+919845217138" <sip:FreeSWITCH@nowconf.pstn.twilio.com>;tag=cvS8XKDp62Z5e
Call-ID: 69171aa5-1d0d-1235-67b0-2e81eca04f81
CSeq: 1 BYE
User-Agent: FreeSWITCH-mod_sofia/1.6.10+git~20160824T215404Z~726448d962~64bit
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Supported: timer, path, replaces
Content-Length: 0

Answer 1

请在发送到Twilio之前删除这两个标头：

P-Preferred-Service: urn:urn-7:3gpp-service.ims.icsi.mmtel 

P-Access-Network-Info: ADSL;utran-cell-id-3gpp=00000000

为此，您必须在向Twilio sip网关发送呼叫之前编写以下两行代码：

<action application="unset" data="sip_h_P-Preferred-Service"/> 

<action application="unset" data="sip_h_P-Access-Network-Info"/>