E8-C上行SIP的作用？

axengine

E8-C终端上行SIP协议的作用是什么？
呼叫？数据？设备注册？

抓到SIP包里的from和to均为：
123024384262
该号码是SIP号码么？该号码与用户号码如何联系?

1. SIP/2.0 200 OK
   
2. Via: SIP/2.0/UDP 10.15.8.164:5060;branch=z9hG4bKc24d5ec7f39fc320
   
3. Via: SIP/2.0/UDP 172.46.16.215:5058;received=172.46.16.215;branch=z9hG4bK272d53267
   
4. To: "123024384262 ";tag=a0f0402-13504
   
5. From: "123024384262 ";tag=9a8c1acffa58a17
   
6. Call-ID: 0004904c5180b821729c54c09e898aed
   
7. CSeq: 2088714443 OPTIONS
   
8. Accept: application/sdp,application/ISUP,text/plain,text/xml-smml,multipart/mixed
   
9. Accept-Encoding: identity
   
10. Accept-Language: en
    
11. Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,INFO,REFER,NOTIFY,PRACK,UPDATE
    
12. Supported: 100rel
    
13. Content-Length: 0

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