Hook flash to asterisk via INFO

So I setup my sipura to send a hook flash to asterisk … I see the SIP debug messages and asterisk is getting the hook flash INFO packet but then I get this weird 403 Unauthorized error … and asterisk never hook flashes the channel (zap channel). Any idea why the unauthorized error is happening please?

kpswitch*CLI>
<-- SIP read from 192.168.254.155:5070:
INFO sip:92629290@192.168.254.105:5070 SIP/2.0
Via: SIP/2.0/UDP 192.168.254.155:5070;branch=z9hG4bK-455ca944
From: Clinic Manager sip:1001@192.168.254.105;tag=6627a326d8c2ad57o1
To: sip:92629290@192.168.254.105;tag=as273ef34d
Call-ID: 44ee0692-dbc0db@192.168.254.155
CSeq: 103 INFO
Max-Forwards: 70
Proxy-Authorization: Digest username=“1001”,realm=“asterisk”,nonce=“2d57433d”,uri=“sip:92629290@192.168.254.105:5070”,algorithm=MD5,response="3a868e7113e2c874595962d6c95a0931"
User-Agent: Sipura/SPA2002-3.1.5
Content-Length: 11
Content-Type: application/hook-flash

Signal=hf
— (11 headers 1 lines)—
Receiving INFO!
Transmitting (no NAT) to 192.168.254.155:5070:
SIP/2.0 403 Unauthorized
Via: SIP/2.0/UDP 192.168.254.155:5070;branch=z9hG4bK-455ca944;received=192.168.254.155
From: Clinic Manager sip:1001@192.168.254.105;tag=6627a326d8c2ad57o1
To: sip:92629290@192.168.254.105;tag=as273ef34d
Call-ID: 44ee0692-dbc0db@192.168.254.155
CSeq: 103 INFO
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: sip:92629290@192.168.254.105:5070
Content-Length: 0
X-Asterisk-HangupCause: Normal Clearing