我为什么会接收到两个“需要 407 代理身份验证”SIP 响应？

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我正在使用 golang 和 freeswitch 开发软件电话解决方案。注册器工作正常，在 freeswitch 上我可以看到我的软件电话代码已注册。我还可以从其他软件电话 (3cx) 向我的代码发送邀请。但如果我尝试致电 3cx，我总是会收到两个“需要 407 代理身份验证”。3

我的期望：

1. 发送邀请
2. 接收所需的代理身份验证
3. 将 auth 放入第二个 invite 中并再次发送
4. 即将建立通话

我得到了什么：

1. 发送邀请
2. 接收所需的代理身份验证
3. 将 auth 放入第二个 invite 中并再次发送
4. 接收所需的代理身份验证
5. 没什么

（我删除了 sip body（优惠），因为它太大了）

2022/07/14 09:34:29.300373 invite.go:42: ↑↑↑
INVITE sip:[email protected]:5066 SIP/2.0
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE 
Content-Type: application/sdp
CSeq: 1 INVITE
Call-ID: b31a98fa-c7d2-46a0-9d3b-ffbe60331dcf
Via: SIP/2.0/WS 192.168.1.108;branch=z9hG4bKe92e138a-709b-4329-ac37-1ec2f88a5cb4
To: <sip:[email protected]:5066>
Supported: replaces
User-Agent: Pion WebRTC SIP Client
From: "Agent 41201"<sip:[email protected]:5066>;tag=1693e249-a531-4012-964e-f9b4133cf6e5
Contact: 41201 <sip:[email protected]:5066>
Content-Length: 4265
Max-Forwards: 70

2022/07/14 09:34:29.327669 websocket_freeswitch.go:47: ↓↓↓
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/WS 192.168.1.108;branch=z9hG4bKe92e138a-709b-4329-ac37-1ec2f88a5cb4;received=192.168.1.110;rport=57576
From: "Agent 41201" <sip:[email protected]:5066>;tag=1693e249-a531-4012-964e-f9b4133cf6e5
To: <sip:[email protected]:5066>;tag=5He1p5m60a5DF
Call-ID: b31a98fa-c7d2-46a0-9d3b-ffbe60331dcf
CSeq: 1 INVITE
User-Agent: FreeSWITCH-mod_sofia/1.6.20~64bit
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Proxy-Authenticate: Digest realm="192.168.1.108", nonce="81f85e27-b5d0-4b27-9358-5eded4524e3a", algorithm=MD5, qop="auth"
Content-Length: 0

2022/07/14 09:34:29.328234 invite.go:42: ↑↑↑
INVITE sip:[email protected]:5066 SIP/2.0
Call-ID: b31a98fa-c7d2-46a0-9d3b-ffbe60331dcf
Via: SIP/2.0/WS 192.168.1.108;branch=z9hG4bK69967eaa-911f-4b89-8566-7b835b4d3b32
To: <sip:[email protected]:5066>
Supported: timer, path, replaces
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE 
Content-Type: application/sdp
CSeq: 4 INVITE
From: "Agent 41201"<sip:[email protected]:5066>;tag=1693e249-a531-4012-964e-f9b4133cf6e5
Contact: 41201 <sip:[email protected]:5066>
Proxy-Authenticate: Digest username="41201", realm="192.168.1.108", nonce="81f85e27-b5d0-4b27-9358-5eded4524e3a", uri="sip:[email protected]:5066", response="b7aae35c040dc1f25484eb96d725d6f3",algorithm=MD5,cnonce="0e6758e1adfccffbd0ad9ffdde3ef655",qop=auth,nc=00000001
User-Agent: Pion WebRTC SIP Client
Content-Length: 4265
Max-Forwards: 70


2022/07/14 09:34:29.348968 websocket_freeswitch.go:47: ↓↓↓
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/WS 192.168.1.108;branch=z9hG4bK69967eaa-911f-4b89-8566-7b835b4d3b32;received=192.168.1.110;rport=57576
From: "Agent 41201" <sip:[email protected]:5066>;tag=1693e249-a531-4012-964e-f9b4133cf6e5
To: <sip:[email protected]:5066>;tag=6t7Sr059XKU0a
Call-ID: b31a98fa-c7d2-46a0-9d3b-ffbe60331dcf
CSeq: 4 INVITE
User-Agent: FreeSWITCH-mod_sofia/1.6.20~64bit
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Proxy-Authenticate: Digest realm="192.168.1.108", nonce="edbe6f39-3aa5-4034-8df8-aae050b77e1a", algorithm=MD5, qop="auth"
Content-Length: 0

正确答案

好的。现在我发现了我的错误。我编写了代理验证而不是代理授权。但现在我收到了请求合并响应。因此 Freeswitch 将其视为重复请求。

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