I have an Aastra 480i set up here with a primary and secondary proxy:

local.cfg:
  sip registrar ip: 192.168.50.5
  sip registrar port: 5060
  sip backup registrar ip: 192.168.50.1
  sip backup registrar port: 5060

I stop asterisk on the primary, and watch the SIP messages go by via syslog, it fails 3 times, and then tries the backup. The backup says '401 Unauthorized', and rather than responding with credentials, the Aastra gives up!

Am I missing a setting?

Here's an example of the dialog:

Mar 24 15:36:10 192.168.50.169 09/3/24 15:36:10.24 0 CSipEngine.cpp:4758
   =====OUT=====>>>>>>>>>>192.168.50.169: Sending SIP packet to: 
192.168.50.1:5060
   REGISTER sip:192.168.50.1:5060 SIP/2.0
   Via: SIP/2.0/UDP 192.168.50.169;branch=z9hG4bK45dcbb99a
   Max-Forwards: 70
   Content-Length: 0
   To: user-001 <sip:[email protected]:5060>
   From: user-001 <sip:[email protected]:5060>;tag=8e36719c23700d6
   Call-ID: [email protected]
   CSeq: 1335153520 REGISTER
   Contact: user-001 <sip:[email protected];transport=udp>;expires=3600
   Allow-Events: talk,hold,conference
   Allow:NOTIFY,REFER,OPTIONS,INVITE,ACK,CANCEL,BYE,INFO
   Expires: 3600
   User-Agent: Aastra 480i/1.4.2.3000 Brcm Callctrl/1.5.1.0 MxSF/v3.2.8.45

   =====OUT=====>>>>>>>>>>END SIP packet
   mac:00-08-5D-03-D6-50

Mar 24 15:36:10 192.168.50.169 09/3/24 15:36:10.25 0 CSipEngine.cpp:4758
   <<<<<<<<<<=====IN=====192.168.50.169: Received SIP packet from: 
192.168.50.1:5060
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 
192.168.50.169;branch=z9hG4bK45dcbb99a;received=192.168.50.169
   From: user-001 <sip:[email protected]:5060>;tag=8e36719c23700d6
   To: user-001 <sip:[email protected]:5060>
   Call-ID: [email protected]
   CSeq: 1335153520 REGISTER
   User-Agent: Asterisk PBX
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
   Supported: replaces
   Contact: <sip:[email protected]>
   Content-Length: 0

   <<<<<<<<<<=====IN=====END SIP packet
   mac:00-08-5D-03-D6-50

Mar 24 15:36:10 192.168.50.169 09/3/24 15:36:10.27 0 CSipEngine.cpp:4758
   <<<<<<<<<<=====IN=====192.168.50.169: Received SIP packet from: 
192.168.50.1:5060
   SIP/2.0 401 Unauthorized
   Via: SIP/2.0/UDP 
192.168.50.169;branch=z9hG4bK45dcbb99a;received=192.168.50.169
   From: user-001 <sip:[email protected]:5060>;tag=8e36719c23700d6
   To: user-001 <sip:[email protected]:5060>;tag=as5f85f2c5
   Call-ID: [email protected]
   CSeq: 1335153520 REGISTER
   User-Agent: Asterisk PBX
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
   Supported: replaces
   WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="2c72d17a"
   Content-Length: 0

   <<<<<<<<<<=====IN=====END SIP packet
   mac:00-08-5D-03-D6-50


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