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Reply To: Call Setup Time

#47764
pix
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javed,

1. phone number is sent during the SDCCH phase, in the DTAP message “SETUP” (field “called party number”), after “AUTHENTICATION” and “CIPHERING”.
The format of the phone number is decimal. Of course it is ciphered, but in the K12 trace, you can read it directly (example : “+33064544454” for an international number)

2. there is a dial tone in the mobile. if there is no dial tone, it might be because the message “ALERT” (from MSC to MS) doesn’t contain a valid “ring tone information” (to be verified, i can’t be sure about this)
The message ALERT is sent at the end of the call setup, after the “ASSIGNMENT COMPLETE” message (= TCH successfully allocated)

Regards,