UAS在发送第一个INVITE的终结应答之前,收到第二个INVITE请求,并且这个请求的Cseq序列号大于第一个INVITE请求,那么就应当给第二个INVITE请求返回一个500(服务器内部错误)应答,并且必须包含一个Retry-After头域,这个头域中应当包含一个0-10秒的随机数。如果UAS正在处理一个INVITE请求的时候又收到了一个在同一个对话...
如果该种情况出现,answer 可拒绝此呼叫 5.1 Unicast Streams 要求 部分要求 要求暂不要求 SIP--ISUP 支持同种类型的多个媒体流,如果该种情况出现,SIP--ISUP 可拒绝此呼叫 5.2 Multicast Streams暂不要求暂不要求暂不要求暂不要求支持多播 35 中国电信 SIP协议标准---协议细则中国电信 SIP 章节标题用户终端 SIP-IS...
Expires. Gives the relative time after which the message (or content) expires. The precise meaning of this is method dependent. The expiration time in an INVITE does not affect the duration of the actual session that may result from the invitation. Session description protocols may offer the ab...
If the template does not exist, according to the normal flow of the process of registration; if there is a template, SIP server to enable users to limit outgoing calls; answer after obtaining permission, SIP server requires that the user is bound to call the phone number corresponding SIP ...
一个成功的INVITE请求(13节)既会创建一个基于两个用户之间的对话,也会基于请求/应答模式(offer-answer)创建一个会话。12节讲述了如何通过target refresh请求来修改一个现存的会话(比如,修改对话的remote target URI)。本节描述如何修改实际的会话(session)。
15127 if (req.method != SIP_ACK)15128 transmit_response(p, "503 Server error", &req); /* We must respond according to RFC 32 15129 /* XXX We could add retry-after to make sure they come back */ 15130 append_history(p, "LockFail", "Owner lock failed, transaction fail...
如之前该节点未与前向网络完成Offer/Answer,则本183消息中应携带SDP信息((SDP信息为提供本次音资源的媒体设备信息) 图 52:被叫侧网络向前向网络提供其他(非振铃行为)音资源网络中提供音资源的某一实体,当确认本实体需对先前完成的Offer/Answer进行修改时(未应答之前),则向前向网络发送UPDATE消息完成协商修改。
After getting information from the location server, it forwards the call to its destination. Once the user agents get to know their address, they can bypass the call, i.e., conversations pass directly.SIP - MessagingSIP messages are of two types − requests and responses.The...
CNFSM TYPE = SIP Offer-Answer CNFSM, Event = E_SIP_DIALOG_ESTD, Current State = S_SIP_EARLY_DIALOG_OFFER_ANSWER_COMPLETE, Next State = S_SIP_MID_DIALOG_IDLE *Jul 2 13:16:30.129: CNFSM TYPE = SIP IWF CNFSM, Event = E_SIP_IWF_EV_CALL_ACTIVE, Current State = CNFSM_CONTAINER_...
Outgoing calls are dropping as soon as answer the call. External incoming calls and internal numbers are working fine. below is my debug ccsip messages output. BOTHRA_KOLKATA#debug ccsip messages SIP Call messages tracing is enabled BOTHRA_KOLKATA#term mon ...