When an agent who uses a softphone like Bicom Systems GLOCOM answers a call, it opens the specified Queue URL. Of course, the softphone must support this feature.

Also, %CALLERID% macro can be used in this URL, so when the softphone opens the link, it will see caller id in place where this macro was.
For example:

 http://domain.com/info/%CALLERID%

If caller id was John, the softphone would open the following URL:

 http://domain.com/info/John

This facility could be used for showing info on current callers to the agent answering the call. Of course, this implies that "http://domain.com" has info on "John". Plain www.exampledomain.com can be specified as a Queue URL which depends on PBX admin.