Hello sir,
Can you tell me how to form a Call Wait service by using SIP ?
Call Wait service is :
User A calls User B , while User B is talking with User C , User B should be
given a sigal that tells him what is happening . User B can do : 1)
go on his talk with User C , do nothing with User A ; or 2) hold User C , and talk
with User A ; or 3) stop talking with User C and talk with User A.
+----------+ +----------+ Media Session +---------+
| User A | | User B | <--------------> | User C |
+----------+ +----------+ +---------+
| INVITE | |
| ----------------------> | |
| | |
| 486 Busy Here | |
| <--------------------- | |
| |
| |
| What should User A do |
| ------------------------> |
| to give User B a signal ?|
| |
| |
Thank you very much !
A college student
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