SIP 401 Unauthorized during working in cluster

Hi, Guys. I’m trying to set up a cluster from two asterisk servers with Freepbx gui.
Server1: 203.59.80.189 (Master)
Server2: 203.59.80.186 (Standby)
Floating IP address(Pacemaker service):203.59.80.183. When I connect to GUI, SSH or other services by using floating ip address everything is fine. But when I’m tring to connect a sip client(Micro sip) to the floating address, I’ve got a next error from SIP:

<--- SIP read from UDP:203.59.72.228:52947 --->
REGISTER sip:203.59.80.183 SIP/2.0
Via: SIP/2.0/UDP 203.59.72.228:52947;rport;branch=z9hG4bKPje61edc8152024bba8ffaeb29ee4af6f5
Max-Forwards: 70
From: "Afanasyev" <sip:777@203.59.80.183>;tag=6745d03d84f24416b09e14e15f7a486e
To: "Afanasyev" <sip:777@203.59.80.183>
Call-ID: b817599aaea14b569b5860b7b6f972a1
CSeq: 18798 REGISTER
User-Agent: MicroSIP/3.18.3
Contact: "Afanasyev" <sip:777@203.59.72.228:52947;ob>
Expires: 300
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Content-Length: 0

<------------->
--- (12 headers 0 lines) ---
Sending to 203.59.72.228:52947 (no NAT)

<--- Transmitting (no NAT) to 203.59.72.228:52947 --->
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 203.59.72.228:52947;branch=z9hG4bKPje61edc8152024bba8ffaeb29ee4af6f5;received=203.59.72.228;rport=52947
From: "Afanasyev" <sip:777@203.59.80.183>;tag=6745d03d84f24416b09e14e15f7a486e
To: "Afanasyev" <sip:777@203.59.80.183>;tag=as6b3755d2
Call-ID: b817599aaea14b569b5860b7b6f972a1
CSeq: 18798 REGISTER
Server: FPBX-14.0.3.13(13.22.0)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="096e31ed"
Content-Length: 0

If i change the domain and sip server in the sip client to a real address one of servers, I’ve got a registration. After sip client is registred it’s working fine on the floating ip address till the registration is over.
So guys do you know how to allow sip clients to get a registration on the floating ip address(made by pacemaker)?

Thanks

Dont want to sound condescending, but I would take a look at how a sip registration works…

Sip phone Server
Register ->
<- 401 Unauthorized
Register ->
<- 200 OK

The difference between the first and second register I leave to you to find out…

Just to add to the previous reply. There are no obvious errors in your log extract. 401 is expected and normal.