End-to-end signaling is done in an IP network by using RFC 2833 RTP packets. As a consequence, stations that support RFC 2833 and digital or analog stations using DSP resources on the Media Gateway Controller, can provide end-to-end signaling.

However, the older IP station firmware versions may be unable to do this. The applicable stations are IP Phone 2001 phase 1, and IP Phone 2004 phase 0 and phase 1. The phase 2 IP Phone 200x is the only version of IP Phone 200x that can perform RFC 2833.

Verify that the station is RFC 2833 compatible. Otherwise, it cannot do end-to-end signaling.

For more information, see End-to-End Signaling in Appendix G: Generic station operations.