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SIP：没有匹配的编解码器/ 480暂时不可用

我正在VoIP环境中安装SIP电话。 有两个系统电话完美地工作（与PBX同一制造商），第三个电话可以被呼叫，但不能呼叫另外两个电话。

集团电话显示错误：“没有匹配的编解码器！呼叫被拒绝”这是从第三个电话的angular度来看的对话： 

INVITE sip:[email protected] SIP/2.0 Via: SIP/2.0/UDP 192.168.0.14:5060;branch=z9hG4bK1040318360;rport From: <sip:192.168.0.250>;tag=1540961770 To: <sip:[email protected]> Call-ID: [email protected] CSeq: 160 INVITE Contact: <sip:192.168.0.14:5060> X-Grandstream-PBX: true Max-Forwards: 70 User-Agent: Grandstream GXP2140 1.0.5.18 Privacy: none P-Preferred-Identity: <sip:192.168.0.250> Supported: replaces, path, timer Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE Content-Type: application/sdp Accept: application/sdp, application/dtmf-relay Content-Length: 306 v=0 o=- 8000 8000 IN IP4 192.168.0.14 s=SIP Call c=IN IP4 192.168.0.14 t=0 0 m=audio 5004 RTP/AVP 9 8 18 2 101 a=sendrecv a=rtpmap:9 G722/8000 a=ptime:20 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:2 G726-32/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 SIP/2.0 480 Temporarily not available Via: SIP/2.0/UDP 192.168.0.14:5060;branch=z9hG4bK1040318360;rport=5060 From: <sip:192.168.0.250>;tag=1540961770 To: <sip:[email protected]>;tag=74C1BCB3775433109F0E49A014240025 Call-ID: [email protected] CSeq: 160 INVITE Content-Length: 0 ACK sip:[email protected] SIP/2.0 Via: SIP/2.0/UDP 192.168.0.14:5060;branch=z9hG4bK1040318360;rport From: <sip:192.168.0.250>;tag=1540961770 To: <sip:[email protected]>;tag=74C1BCB3775433109F0E49A014240025 Call-ID: [email protected] CSeq: 160 ACK Content-Length: 0

但从来电： 

 INVITE sip:[email protected];transport=udp SIP/2.0 Via: SIP/2.0/UDP 192.168.0.250:5060;branch=z9hG4bKE85E5CC7F25533109F4949A014240025;rport From: "Sys Tel 20" <sip:[email protected];user=phone>;tag=1E2DB6AE775433109F0C49A014240025 To: <sip:[email protected];user=phone> Call-ID: 303F5CC7F25533109F4849A014240025 CSeq: 1 INVITE Contact: <sip:[email protected]:5060;transport=udp> Max-Forwards: 70 Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, MESSAGE, SUBSCRIBE, UPDATE, PRACK, REFER Supported: 100rel, replaces, timer User-Agent: hybird_130j V.9.1 Rev. 10 (Patch 4) IPSec Alert-Info: <http://127.0.0.1>;info=alert-internal Allow-Events: refer, message-summary, dialog P-Asserted-Identity: "Sys Tel 20" <sip:[email protected];user=phone> Session-Expires: 1800 Content-Type: application/sdp Content-Length: 328 v=0 o=- 71 1 IN IP4 192.168.0.250 s=SIP call c=IN IP4 192.168.0.250 t=0 0 m=audio 10848 RTP/AVP 0 8 18 2 9 101 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:2 G726-32/8000 a=rtpmap:9 G722/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 a=sendrecv SIP/2.0 100 Trying Via: SIP/2.0/UDP 192.168.0.250:5060;branch=z9hG4bKE85E5CC7F25533109F4949A014240025;rport=5060 From: "Sys Tel 20" <sip:[email protected];user=phone>;tag=1E2DB6AE775433109F0C49A014240025 To: <sip:[email protected];user=phone> Call-ID: 303F5CC7F25533109F4849A014240025 CSeq: 1 INVITE Supported: replaces, path, timer User-Agent: Grandstream GXP2140 1.0.5.18 Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE Content-Length: 0 SIP/2.0 180 Ringing Via: SIP/2.0/UDP 192.168.0.250:5060;branch=z9hG4bKE85E5CC7F25533109F4949A014240025;rport=5060 From: "Sys Tel 20" <sip:[email protected];user=phone>;tag=1E2DB6AE775433109F0C49A014240025 To: <sip:[email protected];user=phone>;tag=471383942 Call-ID: 303F5CC7F25533109F4849A014240025 CSeq: 1 INVITE Contact: <sip:192.168.0.14:5060> Supported: replaces, path, timer User-Agent: Grandstream GXP2140 1.0.5.18 Allow-Events: talk, hold Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE Content-Length: 0 SIP/2.0 200 OK Via: SIP/2.0/UDP 192.168.0.250:5060;branch=z9hG4bKE85E5CC7F25533109F4949A014240025;rport=5060 From: "Sys Tel 20" <sip:[email protected];user=phone>;tag=1E2DB6AE775433109F0C49A014240025 To: <sip:[email protected];user=phone>;tag=471383942 Call-ID: 303F5CC7F25533109F4849A014240025 CSeq: 1 INVITE Contact: <sip:192.168.0.14:5060> Supported: replaces, path, timer User-Agent: Grandstream GXP2140 1.0.5.18 Session-Expires: 1800;refresher=uac Require: timer Allow: INVITE, ACK, OPTIONS, CANCEL, BYE, SUBSCRIBE, NOTIFY, INFO, REFER, UPDATE, MESSAGE Content-Type: application/sdp Content-Length: 306

请注意，两者都提供PCMU / PCMA和其他一些编解码器。 为什么通话失败？

电话的IP是192.168.0.12和192.168.0.14 ，集团电话有192.168.0.250 。

可悲的是，这些非elmeg系统手机没有正确注册。 我必须为Hybird 130j接口中的用户分配PIN，然后用它来对系统进行validation。

Elmeg在任何地方都没有打扰说这个PIN必须被设置，并被用作非elmeg电话的SIP密码。

删除G729，除非你有许可证。

使用711a，711u，722，GSM。

检查手机是否全部注册，并且他们使用相同的传输（udp）以及nat设置都是相同的。