Meaning of "487 Request Terminated"

sip voip
Partho Protim Ghosh picture Partho Protim Ghosh · Mar 25, 2014 · Viewed 105.3k times · Source

Please tell me when a SIP call return 487 Request Terminated? Is it a termination issue?

Answer

Rajesh picture Rajesh · Mar 28, 2014

The 487 Response indicates that the previous request was terminated by user/application action. The most common occurrence is when the CANCEL happens as explained above. But it is also not limited to CANCEL. There are other cases where such responses can be relevant. So it depends on where you are seeing this behavior and whether its a user or application action that caused it.

15.1.2 UAS Behavior==> BYE Handling in RFC 3261

The UAS MUST still respond to any pending requests received for that dialog. It is RECOMMENDED that a 487 (Request Terminated) response be generated to those pending requests.

Related questions

iOS: Open Source VoIP/SIP Objective-C Code

I have been tasked with investigating the feasibility of writing an iPhone App to access our internal VoIP/SIP systems. I've never coded anything close to VoIP before. Are there any open source VoIP/SIP libraries or examples in C …

Read More
C# SIP Stack/Library

I am looking for a good SIP library either written in C# or that provides a C# wrapper. Does not necessarily need to be free. Has anyone used anything good? To clarify, I am talking about the VoIP protocol SIP. …

Read More
with SIP, when to use TCP not UDP?

I know pretty the differences between UDP and TCP in general (eg. http://www.onsip.com/about-voip/sip/udp-versus-tcp-for-voip) Question is, in what circumstances would using TCP as the transport have advantages specifically under SIP VOiP communications?

Read More