Sip Debug:


Sending NOTIFY of type 'report' to 'linksys_phone'
Scheduling destruction of SIP dialog '22ff8fae026f6ed946ece6941a813722@myasterisk.host.com' in 32000 ms (Method: NOTIFY)
Transmitting (NAT) to linksys_phone:60001:
NOTIFY sip:linksys_phone@192.168.1.106:5061 SIP/2.0
Via: SIP/2.0/UDP myasterisk.host.com:5060;branch=z9hG4bK50b71091;rport
Max-Forwards: 70
From: "asterisk" <sip:asterisk@myasterisk.host.com>;tag=as70910d15
To: <sip:linksys_phone@192.168.1.106:5061>
Contact: <sip:asterisk@myasterisk.host.com>
Call-ID: 22ff8fae026f6ed946ece6941a813722@myasterisk.host.com
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX SVN-branch-1.6.2-r230629
Subscription-State: terminated
Event: report
Content-Length: 0

<--- SIP read from UDP:linksys_phone:60001 --->
SIP/2.0 401 Unauthorized
To: <sip:linksys_phone@192.168.1.106:5061>;tag=9a280851587e0abi1
From: "asterisk" <sip:asterisk@myasterisk.host.com>;tag=as70910d15
Call-ID: 22ff8fae026f6ed946ece6941a813722@myasterisk.host.com
CSeq: 102 NOTIFY
Via: SIP/2.0/UDP myasterisk.host.com:5060;branch=z9hG4bK50b71091
Server: Linksys/SPA941-5.1.8
WWW-Authenticate: Digest realm="myasterisk.host.com", nonce="c1432f6c", qop="auth", algorithm=md5

Debug file:

[Nov 20 14:52:56] DEBUG[23004] chan_sip.c: Allocating new SIP dialog for 74f0e6916fa8f56a23491a404b4a43b3@myasterisk.host.com - NOTIFY (No RTP)
[Nov 20 14:52:56] DEBUG[23004] chan_sip.c: OBPROXY: Not applying OBproxy to this call
[Nov 20 14:52:56] DEBUG[23004] chan_sip.c: Initializing initreq for method NOTIFY - callid 22ff8fae026f6ed946ece6941a813722@myasterisk.host.com
[Nov 20 14:52:56] DEBUG[23033] chan_sip.c: Stopping retransmission on '22ff8fae026f6ed946ece6941a813722@myasterisk.host.com' of Request 102: Match Not Found

Sip history:

  * SIP Call
1. SchedDestroy    32000 ms
2. TxReq           NOTIFY / 102 NOTIFY - NOTIFY
3. Rx              SIP/2.0 / 102 NOTIFY / 401 Unauthorized
4. Ignore          Ignoring this retransmit


Line 18215 in chan_sip.c __sip_ack sets ack_res to false and then handle_response drops the packet. It never gets to the code to allow
an authorization response.