Several business telephone systems offer the capability for a user to call into the system and get a dial tone for making external calls:

• Cool PBX

  Cool PBX is based on Asterisk, offering features that allow users to obtain a dial tone for external calls. Cool Telecom service is based on Asterisk PBX technology.

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• Asterisk

  Asterisk is perhaps the widest used system in medium to large enterprises, offering features that allow users to obtain a dial tone for external calls.

• Cisco Unified Communications Manager (CUCM)

  Cisco's CUCM is a widely used system in medium to large enterprises, offering features that allow users to obtain a dial tone for external calls.

• Avaya IP Office

  Avaya IP Office is a flexible phone system with the capability for users to call in and make external calls through the system.

• Mitel (now part of RingCentral)

  Mitel, which is now part of RingCentral, provides solutions that allow users to access a dial tone for external calls.

• 3CX

  3CX is an IP PBX phone system that offers users the ability to call into the system and get a dial tone for making external calls.