Deny or Block a Call from a specific A-number

@190

Dear Colleagues,

We have an SBC Net-Net 9200. Due to many frauds we are facing, I would like to know how I can block or deny calls from a specific A-Number? In this case would be the URI user-part of SIP From Header.

INVITE sip:+00025372040575@66.33.147.149:5060;user=phone SIP/2.0

Via: SIP/2.0/UDP 190.124.66.25:5060;branch=z9hG4bK-1-0

From: sipp <sip:8098098098@190.124.66.25:5060>;tag=1

To: sut <sip:+00025372040575@66.33.147.149:5060>

Call-ID: 1-15554@172.16.154.1

CSeq: 1 INVITE

P-Asserted-Identity: <sip:8098098098@190.124.66.25:5060;user=phone>

Contact: <sip:+18096050099@190.124.66.25:5060;user=phone>

Max-Forwards: 70

Content-Type: application/sdp

Content-Length: 120

Br,

Omar Medina