Signaling is what sets
up sessions and tears them down. This makes signaling indisputable when it comes to
arguing if a service was delivered or not.
In order for a call (or a session within the IMS domain) to be connected, signaling
data must be exchanged between the originating party and the terminating party. In
the legacy public switched telephone network (PSTN), signaling is used to connect each
and every circuit needed to establish an end-to-end connection.
In the SIP domain, signaling is used to negotiate the bandwidth and resource requirements
for a session. Likewise, SIP is used to reserve a port at each of the devices
and reserve that port for the purposes of maintaining a dialog with another entity. It??™s
the same concept, just a different form of signaling. What operators discovered was
that when they used signaling for their billing disputes, simply because of the nature
of what signaling does, the data was indisputable. Without signaling there can be no
connection or session.
This also works to prove subscriber usage. When a subscriber denies connecting or
downloading content, the signaling can be used to provide an audit of the transaction
and an indisputable record of the entire transaction. Any operator who is not using
signaling as a part of its auditing of service delivery is most likely losing money.
Here is how it works.
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