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FP5 release notes have this as a new feature:
Description: Symmetric RTP provides for real time protocol communications over a single User Datagram
Protocol (UDP) port to support both transmit and receive messaging. Contact Center Anywhere previously
supported only unidirectional asymmetric RTP transmission. Two UDP ports were used in a call leg with
one port utilized for transmitting and one port for receiving messages.
IETF standard RFC 4961 is implemented by commercial voice over IP providers and equipment manufacturers to
successfully interoperate with NAT (Network Address Translation) systems that lack integrated ALG (Application
Layer Gateway) functionality as outlined in IETF RFC 4787. Manufacturers of certain SBCs (Session Border
Controllers) require media relay to conform to ‘Address-Dependent’ or ‘Address and Port Dependent’ definitions in
IETF RFC 4787 which requires Symmetric RTP. Having this capability will increase densities by reducing the ports
required and open up compatibility with certain SBCs. No configuration changes are required to enable Symmetric
RTP, this feature is automatic when running Version 8.1.3 Fix Pack 5.