Format of 'user data' sent in GSM networks??

[POSTED TO alt.cellular.gsm - REPLY ON USENET PLEASE]

In <1134665945.100223.106780@f14g2000cwb.googlegroups .com> on 15 Dec 2005
08:59:05 -0800, qazmlp1209@rediffmail.com wrote:

>One basic question on the protocol used for signaling and for sending
>user data in 2G,3G networks:
>
>My understanding is this:
>3G: - SS7 for signaling
> - ATM cells or IP for user data
>
>2G: - SS7 for signaling
> - Which protocol is used for sending user data(both in radio part
>& network), like 'voice' for example?

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