[Users] receiving msgs with invalid port numbers

Hello, Sometimes Openser receives REGISTER messages where the port in the Via and in the Contact is invalid (some number greater than 65536). Does anyone know what causes this? Is it just a bug at the user agent side that I cannot do anything about? thank you for any help George 3(24398) ERROR: parse_via: invalid port number <101160 3(24398) ERROR: parse_via on: <SIP/2.0/UDP 62.1.33.62:101160;branch=z9hG4bKYw5qCaB5TTD1PAvN Max-Forwards: 70 User-Agent: IP PHONE 3 V1.49.002 CFG0 From: "psalidas" <sip:psalidas@i-call.gr>;tag=He0iTAjdDXQBQh0M To: "psalidas" <sip:psalidas@i-call.grCall-ID: MCk3KLwds4XOTvqi(a)62.1.33.621 CSeq: 8692 REGISTER Contact: <sip:psalidas@62.1.33.62:101160Expires: 60 Content-Length: 0 3(24398) ERROR: parse_via parse error, parsed so far:<SIP/2.0/UDP 62.1.33.62:101160;branch=z9hG4bKYw5qCaB5TTD1PAvN 3(24398) ERROR: get_hdr_field: bad via 3(24398) ERROR: parse_msg: message=<REGISTER sip:i-call.gr SIP/2.0 Via: SIP/2.0/UDP 62.1.33.62:101160;branch=z9hG4bKYw5qCaB5TTD1PAvN Max-Forwards: 70 User-Agent: IP PHONE 3 V1.49.002 CFG0 From: "psalidas" <sip:psalidas@i-call.gr>;tag=He0iTAjdDXQBQh0M To: "psalidas" <sip:psalidas@i-call.grCall-ID: MCk3KLwds4XOTvqi(a)62.1.33.621 CSeq: 8692 REGISTER Contact: <sip:psalidas@62.1.33.62:101160Expires: 60 Content-Length: 0 Disclaimer The information in this e-mail and any attachments is confidential. It is intended solely for the attention and use of the named addressee(s). If you are not the intended recipient, or person responsible for delivering this information to the intended recipient, please notify the sender immediately. Unless you are the intended recipient or his/her representative you are not authorized to, and must not, read, copy, distribute, use or retain this message or any part of it. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses.