Fw: [Serusers] Invalid Ip Address

I'm trying to make a forward to another gateway when the call has a prefix. The error as I see is throw from my Cisco Gateway... 09/19-12:25:39.521360 0:1:96:14:3F:1 -> 0:B0:D0:E1:41:17 type:0x800 len:0x1C8 216.24.175.121:5060 -> 196.40.18.82:5060 UDP TTL:235 TOS:0x0 ID:189 IpLen:20 DgmLen:442 SIP/2.0 400 Bad Request - 'Invalid IP Address'.. Via: SIP/2.0/UDP 196.40.18.82;branch=0,SIP/2.0/UDP 196.40.18.26:5060;branch=z9hG4bK932b0300..From: iramirez <sip:123456@196.40.18.82>;tag=ae340300..To: 0018176801038 <sip:0018176801038@196.40.18.82>..Date: Fri, 19 Sep 2003 18:25:35 GMT..Cal l-ID: 1b15030000000000@192.168.0.131..Server: Cisco-SIPGateway/IOS-12.x..CSeq: 1INVITE..Content-Length: 0.... ----- Original Message ----- From: Andrei Pelinescu-Onciul To: Iv?n Ram?rez Cc: Serusers Sent: Friday, September 19, 2003 12:20 PM Subject: Re: [Serusers] Invalid Ip Address On Sep 19, 2003 at 12:15, Iv?n Ram?rez &lt;iramirez(a)cyberfuel.com&gt; wrote: Are you sure this is from ser? Could you send us full message dumps (ngrep), your config and ser logs? Andrei