[asterisk-users] SIP/2.0 489 Bad Event in reply to a PUBLISH

[John Hughes]

Hi, in these dark days of COVID-19 lockdown I'm using linphone to 
connect to my office asterisk system for working from home.

It's going pretty well but the presence/BLF functions don't appear to work.

In the linphone logs and asterisk debug I find that asterisk is 
rejecting linphone's PUBLISH message:

<--- SIP read from UDP:10.27.128.3:5060 --->
PUBLISH sip:john at xxx.xxx.com SIP/2.0
Via: SIP/2.0/UDP 10.27.128.3:5060;branch=z9hG4bK.GRd5yC7Wo;rport
From: <sip:john at xxx.xxx.com>;tag=ZtFgBTxUL
To: sip:john at xxx.xxx.com
CSeq: 20 PUBLISH
Call-ID: SMHLUSLJD6
Max-Forwards: 70
Supported: replaces, outbound
Event: presence
Accept: application/pidf+xml
Content-Length: 511
Content-Type: application/pidf+xml
Expires: 3600
User-Agent: Linphone/3.12.0 (belle-sip/1.6.3)

<?xml version="1.0" encoding="UTF-8"?>
<presence xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model" 
xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid" 
xmlns:pidfonline="http://www.linphone.org/xsds/pidfonline.xsd" 
entity="sip:john at xxx.xxx.com" xmlns="urn:ietf:params:xml:ns:pidf"> 
<tuple id="bhhmlg"> <status> <basic>open</basic> <pidfonline:online/> 
</status> <contact priority="0.8">sip:john at xxx.xxx.com</contact> 
<timestamp>2020-03-23T09:40:43Z</timestamp> </tuple>
</presence>
<------------->
--- (14 headers 3 lines) ---


Sending to 10.27.128.3:5060 (no NAT)

<--- Transmitting (no NAT) to 10.27.128.3:5060 --->
SIP/2.0 489 Bad Event
Via: SIP/2.0/UDP 
10.27.128.3:5060;branch=z9hG4bK.GRd5yC7Wo;received=10.27.128.3;rport=5060
From: <sip:john at xxx.xxx.com>;tag=ZtFgBTxUL
To: sip:john at xxx.xxx.com;tag=as674d428f
Call-ID: SMHLUSLJD6
CSeq: 20 PUBLISH
Server: Asterisk PBX 13.14.1~dfsg-2+deb9u4
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, 
INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0

I can find nothing in the asterisk logs that says *why* it doesn't like 
the publish.

Help?