voip origination and termnation mapping example
Posted on 2005-04-10
Here is an example which I was readng through in order to understand voip mapping.
A call coming from Gateway A reaches GK in the following format: 001#15103459987.
GK strips the origination map for Gateway A 001# and finds in its routing table that
Gateway B serves area code 1510. GK prepends the termination map for Gateway B to the
number and routs the call in the following format to Gateway B: 31169#15103459987.
Gateway B strips the prefix 31169# and terminates the call.
What I want to know is :
when the call reaches the gatekeeper from Gateway with a format of 001#15103459987 who is actually appendindg 001 to the number is it the user ?
and then why is gatekeeper changing it to 31169#15103459987 format, how was this decided ?