T46G Question

[powermatz]

Hello Forum,

my phone shows a strange behavior. I configured two accounts in it.
They register without any problem and I can use the phone as designed.
But: when the internet connections drops once a day only one account can register. The other account can not register anymore.

I used a packet capture tool and I see some strange traffic:
First I see the account which can register:
REGISTER sip:tel.t-online.de SIP/2.0
Via: SIP/2.0/UDP 192.168.20.199:5060;branch=z9hG4bK-886cfc16
From: "06997640441" <sip:06997640441@tel.t-online.de>;tag=10d7c627a74468c1o0
To: "06997640441" <sip:06997640441@tel.t-online.de>
Call-ID: ae8cde19-ffefd5f8@192.168.20.199
CSeq: 43039 REGISTER
Max-Forwards: 70
Authorization: Digest username="lange_matthias@t-online.de",realm="tel.t-online.de",nonce="ac918...06ae70",uri="sip:tel.t-online.de",algorithm=MD5,response="6d30d9....37a25ddf84"
Contact: "06997640441" <sip:06997640441@192.168.20.199:5060>;expires=600
User-Agent: Linksys/SPA8000-6.1.12
Allow-Events: talk, hold, conference
Content-Length: 0
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: x-sipura, replaces

But the other account looks like this:
REGISTER sip:tel.t-online.de:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.20.123:5063;branch=z9hG4bK2130972321
From: "069760023" <sip:069760023@tel.t-online.de>;tag=1752530877
To: "069760023" <sip:069760023@tel.t-online.de>
Call-ID: 1795812648@192.168.20.123
CSeq: 1 REGISTER
Contact: <sip:069760023@192.168.20.123:5063>
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T46G 28.72.0.26
Expires: 60
Allow-Events: talk,hold,conference,refer,check-sync
Content-Length: 0

As you can see the authorization part is missing.

This only happens when the internet connection drops. If the router reboots everything works fine for both accounts.

Any idea?

Matthias