Ola @Fabio Santos fpeixinho,
De acordo com o guia do dispositivo, isso deve ser feito através do Cisco Unified Communications Self Care Portal:
Sign In to the Cisco Unified Communications Self Care Portal
Your phone is a network device that can share information with other network devices in your company, including your personal computer. You can use your computer to sign in to the Cisco Unified Communications Self Care Portal, where you can control features, settings, and services for your phone. For example, you can manage your phone display language, set up services, add entries to your personal address book, and set up speed-dial codes.
Before you can access any of your options, such as speed dial or personal address book, you must sign in. When you finish using the portal, sign out.
Além disso, neste portal você pode configurar para compartilhar um número de telefone entre vários dispositivos:
Shared Lines
Shared lines allow you to use one phone number for multiple phones.
You may have a shared line if you have multiple phones and want one phone number, share call-handling tasks with co-workers, or handle calls on behalf of a manager. For example, if you share a line with a co-worker:
• When a call comes in on the shared line:
◦Your phone rings and the phone light strip flashes amber.
◦Your co-worker’s phone rings and the phone light strip flashes amber.
• If you answer the call:
◦Your phone screen displays a connected icon for the shared call.
◦Your co-worker’s phone screen displays a remote-connected icon for the shared call. If auto barge is enabled, you can auto barge a call by going off-hook or make a new call.
• If you put the call on hold:
◦Your phone screen displays an on-hold icon for the shared call.
◦Your co-worker’s phone screen displays a remote-hold icon for the shared call. Your co-worker can pick up the call.
Deixo o link completo:
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/3905/10_0/english/user_guide/IP05_BK_U2FC56CE_00_user-guide-3905_10_0.pdf
Saudações
