m900 - Ringcentral - no sip reg for extension

I try to setup a simple SIP-Connection between a snom m900 and an SIP login at ringcentral (cloud telephony)

So konfigurieren Sie RingCentral SIP-Einstellungen auf einem M300, M700 und M900

I create a unprovisioned sip device at ringcentral for registering an extension for the snom m900

Connection WITHOUT TLS 1.2

SIP domain              sip.ringcentral.co.uk:5060
Remote SIP port         5060
Local SIP port          5060
Outbound proxy          sip40.ringcentral.com:5090
Outbound proxy port     5090
Username                4991141090512
Password                XXXXXXXXXX
Authorisation ID        162644070

When i test the credentials with MicroSIP Software at the same network/firewall it works and i can make a call without problems.

The snom m900 at the same network - no sip registration for the extension.

snom m900 information

the snom m900 config:

<server>
<srv_att_transfer_2nd_call_on_hold idx="1">on</srv_att_transfer_2nd_call_on_hold>
<srv_broadsoft_calllog_enable idx="1">off</srv_broadsoft_calllog_enable>
<srv_broadsoft_calllog_server_addr idx="1"></srv_broadsoft_calllog_server_addr>
<srv_bw_directed_call_pickup_code idx="1"></srv_bw_directed_call_pickup_code>
<srv_bw_directed_call_pickup_enable idx="1">off</srv_bw_directed_call_pickup_enable>
<srv_bw_group_call_pickup_code idx="1"></srv_bw_group_call_pickup_code>
<srv_bw_group_call_pickup_enable idx="1">off</srv_bw_group_call_pickup_enable>
<srv_client_initiated_connections_enable idx="1">off</srv_client_initiated_connections_enable>
<dial_plan_subscription idx="1">1</dial_plan_subscription>
<srv_dtmf_payload_type idx="1">101</srv_dtmf_payload_type>
<user_dtmf_info idx="1">off</user_dtmf_info>
<srv_confirm_on_transfer_enable idx="1">enabled</srv_confirm_on_transfer_enable>
<srv_failover_sip_deregister_after_failback idx="1">disabled</srv_failover_sip_deregister_after_failback>
<MediasSec_Over_TLS_Only idx="1">disabled</MediasSec_Over_TLS_Only>
<MediaSec_Request idx="1">disabled</MediaSec_Request>
<alert_info_playback idx="1">on</alert_info_playback>
<user_srtp idx="1">disabled</user_srtp>
<semi_attend_transfer idx="1">enabled</semi_attend_transfer>
<srv_sip_cli_mode idx="1">0</srv_sip_cli_mode>
<show_diversion idx="1">on</show_diversion>
<srv_sip_enable_blind_transfer idx="1">on</srv_sip_enable_blind_transfer>
<timer_support idx="1">on</timer_support>
<user_hold_inactive idx="1">off</user_hold_inactive>
<keepalive_interval idx="1">on</keepalive_interval>
<user_moh idx="1"></user_moh>
<srv_sip_rtp_base_equal idx="1">disabled</srv_sip_rtp_base_equal>
<codec_size idx="1">20</codec_size>
<srv_sip_server_alias idx="1">RingCentra</srv_sip_server_alias>
<session_timer idx="1">3600</session_timer>
<srv_sip_show_ext_name_in_hs idx="1">on</srv_sip_show_ext_name_in_hs>
<srv_sip_signal_tcp_port idx="1">on</srv_sip_signal_tcp_port>
<srv_sip_transport idx="1">udp</srv_sip_transport>
<codec_priority_list idx="1">pcmu, pcma, g726</codec_priority_list>
<conferencing idx="1"></conferencing>
<user_host idx="1">sip.ringcentral.co.uk:5060</user_host>
<user_outbound idx="1">sip40.ringcentral.com:5090</user_outbound>
<user_expiry idx="1">3600</user_expiry>
<srv_sip_ua_data_server_nat_adaption idx="1">disabled</srv_sip_ua_data_server_nat_adaption>
<srv_sip_use_one_tcp_conn_per_ext idx="1">off</srv_sip_use_one_tcp_conn_per_ext>
<user_full_sdp_answer idx="1">off</user_full_sdp_answer>
<srv_srtp_auth idx="1">off</srv_srtp_auth>
<user_auth_tag idx="1">on</user_auth_tag>
<srv_use_sip_for_xsi_login idx="1">off</srv_use_sip_for_xsi_login>
<srv_att_transfer_2nd_call_on_hold idx="2">on</srv_att_transfer_2nd_call_on_hold>
<srv_broadsoft_calllog_enable idx="2">off</srv_broadsoft_calllog_enable>
<srv_broadsoft_calllog_server_addr idx="2"></srv_broadsoft_calllog_server_addr>
<srv_bw_directed_call_pickup_code idx="2"></srv_bw_directed_call_pickup_code>
<srv_bw_directed_call_pickup_enable idx="2">off</srv_bw_directed_call_pickup_enable>
<srv_bw_group_call_pickup_code idx="2"></srv_bw_group_call_pickup_code>
<srv_bw_group_call_pickup_enable idx="2">off</srv_bw_group_call_pickup_enable>
<srv_client_initiated_connections_enable idx="2">off</srv_client_initiated_connections_enable>
<dial_plan_subscription idx="2">1</dial_plan_subscription>
<srv_dtmf_payload_type idx="2">101</srv_dtmf_payload_type>
<user_dtmf_info idx="2">off</user_dtmf_info>
<srv_confirm_on_transfer_enable idx="2">enabled</srv_confirm_on_transfer_enable>
<srv_failover_sip_deregister_after_failback idx="2">disabled</srv_failover_sip_deregister_after_failback>
<MediasSec_Over_TLS_Only idx="2">enabled</MediasSec_Over_TLS_Only>
<MediaSec_Request idx="2">enabled</MediaSec_Request>
<alert_info_playback idx="2">on</alert_info_playback>
<user_srtp idx="2">disabled</user_srtp>
<semi_attend_transfer idx="2">enabled</semi_attend_transfer>
<srv_sip_cli_mode idx="2">0</srv_sip_cli_mode>
<show_diversion idx="2">on</show_diversion>
<srv_sip_enable_blind_transfer idx="2">on</srv_sip_enable_blind_transfer>
<timer_support idx="2">on</timer_support>
<user_hold_inactive idx="2">off</user_hold_inactive>
<keepalive_interval idx="2">on</keepalive_interval>
<user_moh idx="2"></user_moh>
<srv_sip_rtp_base_equal idx="2">disabled</srv_sip_rtp_base_equal>
<codec_size idx="2">20</codec_size>
<srv_sip_server_alias idx="2">RC TLS</srv_sip_server_alias>
<session_timer idx="2">3600</session_timer>
<srv_sip_show_ext_name_in_hs idx="2">on</srv_sip_show_ext_name_in_hs>
<srv_sip_signal_tcp_port idx="2">on</srv_sip_signal_tcp_port>
<srv_sip_transport idx="2">udp</srv_sip_transport>
<codec_priority_list idx="2">pcmu, pcma, g726</codec_priority_list>
<conferencing idx="2"></conferencing>
<user_host idx="2">sip.ringcentral.co.uk:5060</user_host>
<user_outbound idx="2">sip40.ringcentral.com:5096</user_outbound>
<user_expiry idx="2">3600</user_expiry>
<srv_sip_ua_data_server_nat_adaption idx="2">enabled</srv_sip_ua_data_server_nat_adaption>
<srv_sip_use_one_tcp_conn_per_ext idx="2">off</srv_sip_use_one_tcp_conn_per_ext>
<user_full_sdp_answer idx="2">off</user_full_sdp_answer>
<srv_srtp_auth idx="2">on</srv_srtp_auth>
<user_auth_tag idx="2">on</user_auth_tag>
<srv_use_sip_for_xsi_login idx="2">off</srv_use_sip_for_xsi_login>
</server>

<extension>
<!-- <subscr_dect_ac_code idx="1">**********</subscr_dect_ac_code> -->
<subscr_dect_ipui idx="1">0xFFFFFFFFFF</subscr_dect_ipui>
<push_to_talk idx="1">off</push_to_talk>
<subscr_sip_hs_idx idx="1">1</subscr_sip_hs_idx>
<subscr_sip_line_name idx="1">SL</subscr_sip_line_name>
<!-- <subscr_sip_pincode_dialout idx="1">**********</subscr_sip_pincode_dialout> -->
<user_pname idx="1">162644070</user_pname>
<!-- <user_pass idx="1">**********</user_pass> -->
<dfks idx="1">off</dfks>
<user_shared_line idx="1">off</user_shared_line>
<call_waiting idx="1">on</call_waiting>
<user_active idx="1">on</user_active>
<fwd_busy_enabled idx="1">off</fwd_busy_enabled>
<fwd_time_enabled idx="1">off</fwd_time_enabled>
<fwd_all_enabled idx="1">off</fwd_all_enabled>
<fwd_busy_target idx="1"></fwd_busy_target>
<fwd_time_target idx="1"></fwd_time_target>
<fwd_all_target idx="1"></fwd_all_target>
<fwd_time_secs idx="1">90</fwd_time_secs>
<subscr_sip_ua_data_server_id idx="1">1</subscr_sip_ua_data_server_id>
<user_name idx="1">4991141090512</user_name>
<user_mailbox idx="1"></user_mailbox>
<user_mailnumber idx="1"></user_mailnumber>
<subscr_sip_ua_pref_outg_sip_id idx="1"></subscr_sip_ua_pref_outg_sip_id>
<subscr_sip_ua_use_base idx="1">255</subscr_sip_ua_use_base>
<subscr_ua_data_bw_blf_reslist_uri idx="1"></subscr_ua_data_bw_blf_reslist_uri>
<user_shared_line_mapping idx="1">65535, 65535, 65535, 65535, 65535, 65535, 65535, 65535</user_shared_line_mapping>
<user_realname idx="1"></user_realname>
<subscr_ua_data_emergency_line idx="1">65535</subscr_ua_data_emergency_line>
<subscr_ua_data_emergency_number idx="1"></subscr_ua_data_emergency_number>
<subscr_ua_data_emergency_profiles idx="1">00000000</subscr_ua_data_emergency_profiles>
<xsi_auth_user idx="1"></xsi_auth_user>
<xsi_auth_pass idx="1">**********</xsi_auth_pass>
</extension>