Verifica que el problema no sea falla de conexión entre el servidor y tu NTP, o que el NTP sea quien introduzca el problema.
Es recomendable usar 3 o más NTPs para tener fuentes de referencia y redundancia.
In this video, I'll show you how to configure the user's photos in a MS IIS Web Server for Jabber, when using UDS, this method will also work over MRA
You can find how to install IIS on your server here:
Installing IIS 8 on Windows Server 2012ht...
In this video, I'll show you how to configure the user's photos in a MS IIS Web Server for Jabber, when using LDAP as the directory.
You can find how to install IIS on your server here:
Installing IIS 8 on Windows Server 2012http://www.iis.net...
In this video, I'll show you how to configure the user's photos in your LDAP server, using a 3rd party application called CodeTwo Active Directory Photos.
You can find the the tool I used here:http://www.codetwo.com/freeware/active-directory-photo...
You're probably using this
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1SU3/cucm_b_feature-configuration-guide-for-cisco1251su3/cucm_m_phone-replacement-migration-ivr-phone.html
You need to reach out to a local partner with UC specializations to discuss what would be the best fit for your needs and your usage requirements. They'll ask you a lot of questions to determine what you need and what's the best fit from the portfoli...