Phase 5：Dialog + RegistrationClient + OptionsProbe + Digest 鉴权 - #10
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Phase 5：Dialog + RegistrationClient + OptionsProbe + Digest 鉴权#10lixuanqun wants to merge 1 commit into
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sip-dialog 模块 - DialogId：(callId, localTag, remoteTag) — RFC 3261 §12.1.1 - DialogState：EARLY / CONFIRMED / TERMINATED - Dialog · fromUacResponse：UAC 视角，UAC route set = reverse(Record-Route) · fromUasRequest：UAS 视角，UAS route set = Record-Route 原序 · remoteTarget 自动从 Contact 解析 · nextLocalCSeq 单调递增 · onResponse 把 EARLY 升级为 CONFIRMED · refreshRemoteTarget 实现 RFC §12.2.1.2 target refresh - DialogTest（5 个）：UAC/UAS 构造、route set 顺序、early→confirmed、CSeq 单调 sip-ua 模块 - SipStackInfo + Branch（RFC §8.1.1.7 magic cookie + 96-bit 随机熵） - auth/DigestChallenge：解析 WWW-Authenticate / Proxy-Authenticate · 支持 RFC 7616 SHA-256 / SHA-512-256 与 RFC 2617 MD5 · realm / nonce 必需；opaque / qop / stale / algorithm 可选 · 自实现 quoted-string + escape 解析 - auth/DigestResponse：构造 Authorization header · HA1 / HA2 / response 按 RFC 7616 §3.4 计算 · qop=auth 时附 cnonce/nc；无 qop 走 legacy · 算法映射 MD5/SHA-256/SHA-512-256 - RegistrationClient · 构造 REGISTER（含 Via 带 rport、Contact、Expires、User-Agent） · 走 NonInviteClientTransaction · 收到 401/407 自动用 Digest 凭据重发（一次性，不重试第二次） · 自动选 WWW-Authenticate vs Proxy-Authenticate 对应的 Authorization header - OptionsProbe：OPTIONS 检测可用性，CompletableFuture<SipResponse> 返回 测试（12 个） - DigestChallengeTest：6 个（basic、MD5 legacy、opaque/stale、非 Digest 拒、缺 realm/nonce 拒） - DigestResponseTest：4 个（RFC 7616 例验证、SHA-256 哈希长度、无 qop 路径、MD5 哈希正确性） - RegistrationClientTest：2 个（请求字段、自定义 Expires 值） mvn verify：9 模块 SUCCESS，全 158 tests 通过。 Co-authored-by: li xuanqun <793005378@qq.com>
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概述
把"事务上面那一层"补完：Dialog（RFC 3261 §12）、Digest 鉴权（RFC 7616 + 兼容 MD5 legacy）、REGISTER 客户端（RFC 3261 §10）、OPTIONS probe（§11）。
sip-dialog
DialogId：(callId, localTag, remoteTag)，三元组身份DialogState：EARLY / CONFIRMED / TERMINATEDDialog：fromUacResponse(request, response)— UAC 视角；route set = reverse(Record-Route)fromUasRequest(request, response)— UAS 视角；route set = Record-Route 原序nextLocalCSeq()单调递增供 in-dialog request 使用onResponse把 EARLY → CONFIRMEDrefreshRemoteTarget实现 §12.2.1.2 target refreshsip-ua
鉴权（
com.sip.ua.auth）DigestChallenge.parse(headerValue)— 解析 WWW-Authenticate / Proxy-AuthenticateDigestCredentials— username + passwordDigestResponse.authorizationHeader(method, uri, nc, challenge, credentials)REGISTER + OPTIONS
Branch.newBranch()— RFC §8.1.1.7 magic cookie + 96-bit 随机熵RegistrationClientNonInviteClientTransaction（无锁、非阻塞）OptionsProbe— 同样架构，用于检测对端可用性测试
12 个新测试：
DialogTest— 5DigestChallengeTest— 6（含 GB28181 风格的 MD5 legacy 挑战）DigestResponseTest— 4（RFC 7616 example、SHA-256 哈希长度、无 qop 路径、MD5 算式验证）RegistrationClientTest— 2（请求字段、自定义 Expires）验证