3CX doesnt answer to register since Update to 16.0.3

[Sommer]

Hello,

I just wanted to report, that after the update to 16.0.3 one of our doorphones wasn't able to register to the system anymore.
We checked the Wireshark trace and found out that the doorphone did send an REGISTER but the 3CX just didn't answer in any way.

The problem were the umlauts in the system name, which was sent with the SIP-request.
From: "T\374r\366ffner Erdgeschoss" <sip:[email protected]>;tag=2076560655

After changing from "Türöffner Erdgeschoss" to "Tueroeffner Erdgeschoss" it immediatly registered again

Please fix. This cost us 3 hours of our time we'll never get back..

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Frame 217: 447 bytes on wire (3576 bits), 447 bytes captured (3576 bits)
Ethernet II, Src: CamilleB_51:17:63 (00:12:34:51:17:63), Dst: Microsof_16:5d:08 (00:15:5d:16:5d:08)
Internet Protocol Version 4, Src: XXX.XXX.XXX.XXX, Dst: XXX.XXX.XXX.XXX
User Datagram Protocol, Src Port: 5060, Dst Port: 5060
Session Initiation Protocol (REGISTER)
Request-Line: REGISTER sip:XXX.XXX.XXX.XXX SIP/2.0
Method: REGISTER
Request-URI: sip:XXX.XXX.XXX.XXX
Request-URI Host Part: XXX.XXX.XXX.XXX
[Resent Packet: False]
Message Header
Via: SIP/2.0/UDP XXX.XXX.XXX.XXX:5060;rport;branch=z9hG4bK1412271176
From: "T\374r\366ffner Erdgeschoss" <sip:[email protected]>;tag=2076560655
To: "T\374r\366ffner Erdgeschoss" <sip:[email protected]>
Call-ID: 1384490628
CSeq: 1 REGISTER
Contact: <sip:[email protected]:5060;line=03d37718dcaf4cb>
Max-Forwards: 70
User-Agent: VoIP Guard
Expires: 600
Content-Length: 0