Network switching subsystem (NSS) (or GSM core network) is the component of a GSM system that carries out call switching and mobility management functions for mobile phones roaming on the network of base stations. It is owned and deployed by mobile phone operators and allows mobile devices to communicate with each other and telephones in the wider public switched telephone network (PSTN). The architecture contains specific features and functions which are needed because the phones are not fixed in one location.
The NSS originally consisted of the circuit-switched core network, used for traditional GSM services such as voice calls, SMS, and circuit switched data calls. It was extended with an overlay architecture to provide packet-switched data services known as the GPRS core network. This allows mobile phones to have access to services such as WAP, MMS and the Internet.
The mobile switching center (MSC) is the primary service delivery node for GSM/CDMA, responsible for routing voice calls and SMS as well as other services (such as conference calls, FAX and circuit switched data).
Someone said they'd like
To set you up
They're gonna feed on
You just sleep now
Should've know they'd
Try and make you cry
They're gonna have fun
Now don't fight it
Let me come undone in
Your house
I need to kill some
Time tonite
Let me come undone in
Your mouth
I need to know that your
The same
Could've guessed you
Were the only one
They wanted to laugh at
Believe them
No surprise you let it
Get to you
It was always there
Can't hide it
Your face is easy to hate
Looking helpless
And sincere
Curls up in self-sickness
Lick your wounds and
Dream of home
Let me come undone in
Your house
Let me come undone
And kill some time
Let me come undone in
Your mouth
Let me come undone