Hello, Is it possible to associate an Username with only one or more Phone Number ? My problem is when a UA send an invite with a BAD phone Number, he have to be stoped by SER. Is the "From" field, that i want to secure. U 62.39.69.11:20187 -> 80.118.128.5:5060 INVITE sip:0156383971@sip.vivaction.net;user=phone SIP/2.0..Via: SIP/2.0/UDP 62.39.69.11:20187;branch=z9hG4bKacvxAsGIo..From: < sip:156384290@sip.vivaction.net>;tag=1c10095..To: <sip:0156383971@sip.vivaction.net>..Call-ID: 114402722127221Jakp-156384290--0 156383971@62.39.69.11..CSeq: 46418 INVITE..Contact: <sip:156384290@62.39.69.11:20187;user=phone>..Proxy-Authorization:Digest us ername="*********",realm="sip.vivaction.net",nc=00000001,cnonce="",nonce="41 5d5a9abfaa92e7223274a4cccbcdf474bededf",uri="sip:01 56383971@sip.vivaction.net",qop=auth,Algorithm="MD5",response="9b571eeddfd5c 5b56e8b48450b22b826"..Supported: em,timer..Accept-L anguage: en..Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE..Us er-Agent: Audiocodes-Sip-Gatewa y/MP-104 FXS/v.4.20.299.4192..Content-Type: application/sdp..Content-Length: 209....v=0..o=AudiocodesGW 13428 10067 IN IP4 62.3 9.69.11..s=Phone-Call..c=IN IP4 62.39.69.11..t=0 0..m=audio 20202 RTP/AVP 18 96..a=rtpmap:18 g729/8000..a=rtpmap:96 telephone-e vent/8000..a=fmtp:96 0-15..a=ptime:20.. Thanks a lot Best Regards Nicolas RUIZ