[Asterisk-Users] Grandstream Budge Tone 101 keeps deregistering

[Marcel Hecko]

Hello,
I have a problem with one of three [topic] phones. The phone, which is
on the LAN in the same subnet as Asterisk, keeps unregistering from the
Asterisk server. Whan it is unregistered there is no way to make a phone
call from it, but once it is rang by any other of the phones it
registers to Asterisk again. The other two are absolutely fine.

The problematic one [ecco] puts this messages into messages log file:

Apr 21 15:27:23 NOTICE[1099] chan_sip.c: Auto-congesting SIP/ecco-9091
Apr 21 15:27:23 WARNING[1077] channel.c: Avoided initial deadlock for
'0x8129f38', 10 retries!

sip.conf:
[ecco]
type=friend
username=ecco
defaultip=10.10.129.31
host=dynamic
nat=no
canreinvite=no
qualify=yes
dtmfmode=rfc2833


Can somebody please explain what these messages mean?
What is '0x8129f38'?
Can somebody please post working sip.conf (full) for Grandstream (101)
phones. I have discussed this topic with Google for quite a long time,
but with no results.

Thank you very much.
Marcel