Asterisk an T-Com Anschluss - plötzlich keine Nummernregistrierung mehr möglich

Ich betreibe einen Asterisk-Server (13.1 LTS) hinter einem T-Com Anschluss mit dynamischer IP hinter einem NAT-Router. Plötzlich, seit heute morgen, keine Registrierung mehr möglich. Ich kann den Server neustarten, so oft ich mag. Das ganze lief jetzt zwei Wochen ohne Probleme und nun das:

Code:

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[Nov 13 10:50:38] NOTICE[763] chan_sip.c:    -- Registration for '0725312345@tel.t-online.de' timed out, trying again (Attempt #6)
[Nov 13 10:50:38] NOTICE[763] chan_sip.c:    -- Registration for '0725367890@tel.t-online.de' timed out, trying again (Attempt #6)
[Nov 13 10:50:38] NOTICE[763] chan_sip.c:    -- Registration for '0725312378@tel.t-online.de' timed out, trying again (Attempt #6)

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Ab und an mal:

Code:

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[Nov 13 10:41:09] WARNING[763] chan_sip.c: Retransmission timeout reached on transmission 7683e9e0137383d7224b730f4ec5592f@192.168.1.61 for seqno 102 (Critical Request) -- See http://ift.tt/1ignKK6
Packet timed out after 32000ms with no response
[Nov 13 10:41:09] WARNING[763] chan_sip.c: Retransmission timeout reached on transmission 16a5ea5834d5eec674c647472072dcc0@192.168.1.61 for seqno 102 (Critical Request) -- See http://ift.tt/1ignKK6
Packet timed out after 32000ms with no response
[Nov 13 10:41:09] WARNING[763] chan_sip.c: Retransmission timeout reached on transmission 096d4a677eb6e935270bc69f4fcbf898@192.168.1.61 for seqno 102 (Critical Request) -- See http://ift.tt/1ignKK6

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Ist jemand von demselben Problem betroffen, das es plötzlich nicht mehr tut (ohne Config-Änderung)? Hat die T-Com was umgebaut?

sip.conf:

Code:

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[general]
context=public                  ; Default context for incoming calls. Defaults to 'default'
allowoverlap=no                ; Disable overlap dialing support. (Default is yes)
udpbindaddr=0.0.0.0            ; IP address to bind UDP listen socket to (0.0.0.0 binds to all)
tcpenable=no                    ; Enable server for incoming TCP connections (default is no)
tcpbindaddr=0.0.0.0            ; IP address for TCP server to bind to (0.0.0.0 binds to all interfaces)
transport=udp                  ; Set the default transports.  The order determines the primary default transport.
srvlookup=yes                  ; Enable DNS SRV lookups on outbound calls
qualify=yes
register=0725312345:01234567:mymail@t-online.de@http://ift.tt/1QlHbTK
register=0725367890:01234567:mymail@t-online.de@http://ift.tt/1O6JruC
register=0725312378:01234567:mymail@t-online.de@http://ift.tt/1O6JsPf
bindport=5060
allowguest=no
alwaysauthrejct=yes
externhost=mydnsname.dyndns.org
externrefresh=30
localnet=192.168.1.0/255.255.255.0
disallow=all
allow=alaw,ulaw,gsm
maxexpiry=3600
defaultexiry=1800
registertimeout=120
language=de

[tcom-in]
qualify=yes
type=peer
context=incoming
allow=ulaw,alaw,g722
session-timers=refuse
defaultuser=mymail@t-online.de
authuser=mymail@t-online.de
remotesecret=1234567
sendrpid = no
trustrpid = yes
host=tel.t-online.de
fromdomain=tel.t-online.de
nat=auto_force,auto_comedia
directmedia=no

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STUN habe ich auch drin. Das funktioniert alles.

Asterisk an T-Com Anschluss - plötzlich keine Nummernregistrierung mehr möglich