[asterisk-users] failed to find existing extension

[asterisk at a-domani.nl]

Hi all

some how I'm getting confused: it seems I clobbered incoming calls from 
my sip provider.
I can not imagine that my upgrade from 15.3 to 15.5 could be related

I'm certain that dialling my own number, results in reaching asterisk, 
from my tcpdump.

And on the asterisk console I get:
pbx*CLI>
   == Using SIP RTP CoS mark 5
        > 0x7f49ac54c040 -- Strict RTP learning after remote address set 
to: 185.29.203.27:62474
[Sep  8 22:12:50] NOTICE[835][C-00000028]: chan_sip.c:26513 
handle_request_invite: Call from '77707057984' (185.29.203.27:5060) to 
extension '31705680837' rejected because extension not found in context 
'[0705680837]'.
pbx*CLI>

Which is strange, as the first lines from the dialplan for this context 
are:
[0705680837]

exten => s,1,NooP(Default general incoming on CC)
  same => n,Answer();
  same => n,Background(dit_is_het_nummer_van_de_familie_witvliet)
  same => n,WaitExten(2)

exten => i,1,NooP(Invalid general incoming on CC)
  same => n,Answer
  same => n,Playback(pbx-invalid)
  same => n,,Hangup

exten => 31705680837,1,NooP( Incoming 31705680837 on CC)
  same => n,Answer();
  same => n,Background(dit_is_het_nummer_van_de_familie_witvliet)
  same => n,Wait(1)
  same => n,Hangup()

and settings are up-to-date; when i do:
pbx*CLI> dialplan show 31705680837 at 0705680837
[ Context '0705680837' created by 'pbx_config' ]
   '31705680837' =>  1. NooP( Incoming 31705680837 on CC)          
[extensions.conf:625]
                     2. Answer()                                   
[extensions.conf:632]
                     3. 
Background(dit_is_het_nummer_van_de_familie_witvliet) 
[extensions.conf:633]
                     4. Wait(1)                                    
[extensions.conf:634]
                     5. Hangup()                                   
[extensions.conf:635]
   '_X.05680837' =>  1. NooP(general S Incoming *5680837 on CC)    
[extensions.conf:649]
                     2. Answer()                                   
[extensions.conf:650]
                     3. 
Background(dit_is_het_nummer_van_de_familie_witvliet) 
[extensions.conf:651]
                     4. Wait(1)                                    
[extensions.conf:652]
                     5. Hangup()                                   
[extensions.conf:653]
   '_X.' =>          1. NooP(general incoming on CC)               
[extensions.conf:620]
                     2. Answer()                                   
[extensions.conf:621]
                     3. 
Background(dit_is_het_nummer_van_de_familie_witvliet) 
[extensions.conf:622]
                     4. WaitExten(2)                               
[extensions.conf:623]
-= 3 extensions (14 priorities) in 1 context. =-
(yeah, i know, last one is pretty desperate)

Still, asterisk answers
22:03:43.608225 IP (tos 0x0, ttl 64, id 35247, offset 0, flags [none], 
proto UDP (17), length 476)
     192.168.0.25.5060 > 185.29.203.27.5060: SIP, length: 448
         SIP/2.0 404 Not Found
         Via: SIP/2.0/UDP 
185.29.203.27:5060;branch=z9hG4bKf4fd.4361f417.0;received=185.29.203.27;rport=5060
         From: <sip:0630519252 at 185.29.203.27>;tag=d4qpms6vsntnh6bj.o
         To: <sip:31705680837 at mtsip.nl>;tag=as7d7a0cb7
         Call-ID: SBC32.261.6202722
         CSeq: 881 INVITE
         Server: Asterisk PBX 15.5.0
         Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, 
NOTIFY, INFO, PUBLISH, MESSAGE
         Supported: replaces, timer
         Content-Length: 0


So, tcpdump and *-logging seems to match with each other, but not with 
my dialplan :-(


Any suggestion how I should examine this?

Kind regards, Hans.