SIP Response for Cisco Expressway-E: Examining Initial SIP REGISTER Request from Jabber Client
Question
Company ABC is deploying Mobile and Remote Access (MRA) to allow employees to login Jabber clients from anywhere on the internet.
Which SIP Response does a Cisco Expressway-E send when it receives an initial SIP REGISTER request from a Jabber client?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D. E.Explanation.
When a Jabber client sends a SIP REGISTER request to Cisco Expressway-E in order to register for Mobile and Remote Access (MRA), the Cisco Expressway-E will send a SIP response back to the Jabber client.
The correct answer is B. 200 OK.
The SIP 200 OK response indicates that the Cisco Expressway-E has successfully received and processed the SIP REGISTER request from the Jabber client. This response also includes important information, such as the expiration time for the registration, which tells the Jabber client how long it can remain registered with the Cisco Expressway-E.
In contrast, the other SIP responses listed in the answer choices have different meanings:
A. 494 Security Agreement Required: This response indicates that the Cisco Expressway-E requires the Jabber client to establish a secure connection before it can register.
C. 491 Request Pending: This response indicates that the Cisco Expressway-E is still processing the SIP REGISTER request and has not yet completed it.
D. 305 Use Proxy: This response indicates that the Cisco Expressway-E is acting as a proxy and is requesting that the Jabber client use a different SIP proxy server to complete the registration.
E. 407 Proxy Authentication Required: This response indicates that the Cisco Expressway-E requires the Jabber client to provide authentication credentials before it can register.
