IP Office supports in-band announcements such as:
Branding from discount or bulk long distance providers
Progress indications when extraordinary wait times are inherent in the call scenario, for example when trying to locate a cell phone
Country-specific ring back and other progress tones
Conferencing in the IP domain before call answer, for example, in call recording scenarios or for automatic dialers' conferencing in agents
Implementation engineers can configure SIP trunks to support early media by adding the 100rel to Supported header in the INVITE parameter.