[Kamailio-Users] Rogue UAC: location database not updated

[CSB]

>Oct 14 15:59:58 beta /sbin/openser[32535]: ERROR:core:parse_from_header:
bad from header
>Oct 14 15:59:58 beta /sbin/openser[32535]: ERROR:core:pv_get_from_attr:
cannot parse From header
>Oct 14 15:59:58 beta /sbin/openser[32535]: ERROR:core:parse_from_header:
bad from header
>Oct 14 15:59:58 beta /sbin/openser[32535]: ERROR:core:pv_get_from_attr:
cannot parse From header
>
>This seems to have been caused by one rogue UAC and has the effect of
preventing entries being written to the location database. 
>
>My question: could anyone suggest how to prevent a UAC which is sending
some weird data from causing the server to choke?

To replicate this issue, in a SPA2102 or similar enter the following data:
in the Proxy field
>domain.com
in the outbound proxy field
domain.com
i.e. prefix the domain with >

The REGISTER message:
REGISTER sip:>domain.com SIP/2.0
Via: SIP/2.0/UDP 192.168.1.112:5060;branch=z9hG4bK-a6a8f8f6
From: $user <sip:12345678@>domain.com>;tag=51d182cf9ed176f3o0
To: $user <sip:12345678@>domain.com>
Call-ID: 363d0b66-60522e90 at 127.0.0.1
CSeq: 22061 REGISTER
Max-Forwards: 70
Contact: $user <sip:12345678 at 192.168.1.112:5060>;expires=360
User-Agent: Linksys/SPA3102-5.1.7(GW)
Content-Length: 0
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: x-sipura, replaces

Could anyone suggest how to better handle this scenario?

Thanks