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Every SP is identified by a signalling point code (SPC). exchange .... the DPC or OPC is an international, national, or network. dependent SP identifier. ...please visit
ftp.rz.tu-bs.de/pub/mirror/ccc_Chaos_Computer_Club/ftp.ccc.de/docs/sigint/enfopol-2002/Telco_Surveillance.../ss7.../ss7.pdf -

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Posted by waqasahmad

In general International point codes are formatted as a 3-bit zone identification,an 8 bit area or network identification and a 3-bit signaling point identification and National point code can be any variation as long as the total field length remain same.

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Posted by HamidAliKhan

plz visit the following link

http://www.telecomspace.com/forum/index.php/topic,131.0.html

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Posted by Hash007

International point codes are formatted as a 3-bit zone identification,an 8 bit area or network identification and a 3-bit signaling point identification.

National point code can be any variation as long as the total field length remain same.

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Posted by sagitraz