Request 'REGISTER' failed

Hy there,
does anyone has an idea weather my phone can not register at extention 001 but can register at extention 002? Extentions have the same config.
ext 001 says:
NOTICE[35168]: res_pjsip/pjsip_distributor.c:676 log_failed_request: Request ‘REGISTER’ from ‘“Arbeitszimmer” sip:[email protected]’ failed for ‘[my-home-IP]:62651’ (callid: [email protected]) - Failed to authenticate
With changed PW and ext 002 it says:
– Added contact ‘sip:[email protected][my_home_IP]:62654;x-ast-orig-host=192.168.50.7:5060’ to AOR ‘002’ with expiration of 3600 seconds
== Endpoint 002 is now Reachable
– Contact 002/sip:[email protected][my_home_IP]:62654;x-ast-orig-host=192.168.50.7:5060 is now Reachable. RTT: 99.117 msec

PJSIP.Endpoint.conf is:
[002]
type=endpoint
aors=002
auth=002-auth
tos_audio=ef
tos_video=af41
cos_audio=5
cos_video=4
allow=ulaw,alaw,gsm,h264,mpeg4
context=from-internal
callerid=ArbeitszimmerWeb <002>

dtmf_mode=rfc4733
direct_media=yes
[email protected]e

mwi_subscribe_replaces_unsolicited=yes
aggregate_mwi=no
use_avpf=yes
rtcp_mux=yes
max_audio_streams=1
max_video_streams=1
bundle=yes
ice_support=yes
media_use_received_transport=yes
trust_id_inbound=yes
user_eq_phone=no
send_connected_line=yes
media_encryption=sdes
timers=yes
timers_min_se=90
media_encryption_optimistic=yes
refer_blind_progress=yes
refer_blind_progress=yes
rtp_timeout=30
rtp_timeout_hold=300
send_pai=yes
rtp_symmetric=yes
rewrite_contact=yes
force_rport=yes
language=de_DE
one_touch_recording=on
record_on_feature=apprecord
record_off_feature=apprecord

[001]
type=endpoint
aors=001
auth=001-auth
tos_audio=ef
tos_video=af41
cos_audio=5
cos_video=4
allow=ulaw,alaw,gsm,h264,mpeg4
context=from-internal
callerid=Arbeitszimmer <001>

dtmf_mode=rfc4733
direct_media=yes
[email protected]

mwi_subscribe_replaces_unsolicited=yes
aggregate_mwi=no
use_avpf=yes
rtcp_mux=yes
max_audio_streams=1
max_video_streams=1
bundle=yes
ice_support=yes
media_use_received_transport=yes
trust_id_inbound=yes
user_eq_phone=no
send_connected_line=yes
media_encryption=sdes
timers=yes
timers_min_se=90
media_encryption_optimistic=yes
refer_blind_progress=yes
refer_blind_progress=yes
rtp_timeout=30
rtp_timeout_hold=300
send_pai=yes
rtp_symmetric=yes
rewrite_contact=yes
force_rport=yes
language=de_DE
one_touch_recording=on
record_on_feature=apprecord
record_off_feature=apprecord

No differences between the extensions in pjsip.auth.conf, exept ext-number and PW.

Does anyone has an idea where I can look further for not-register reasons?