Internal and External Calling: Users can make and receive both internal calls within the organization and external calls to outside numbers, supporting seamless communication.

Voicemail and Unified Messaging: Telephone systems often include voicemail capabilities, allowing users to receive and manage voice messages. Some systems also offer unified messaging, integrating voicemail, email, and fax messages into a single inbox.

Call Routing and Auto-Attendant: Advanced call routing features enable incoming calls to be directed to the appropriate extension or department automatically. Auto-attendant functionality provides callers with menu options to route their calls without human intervention.

Conference Calling: Many telephone systems support conference calling, allowing multiple participants to join a single call, facilitating collaboration and meetings.

Call Transfer and Forwarding: Users can transfer calls to other extensions or forward calls to mobile phones or voicemail, ensuring calls are handled efficiently and reach the intended recipient.

Call Recording: Some telephone systems offer call recording capabilities for quality assurance, training, or compliance purposes, enabling users to record and review calls as needed.