Cisco Cisco IOS Software Release 12.2(2)XA

Dual Tone Multi-Frequency (DTMF) tunneling

Public Switched Telephone Network (PSTN) fallback based on Voice Over IP (VoIP) network 
congestion

Call admission control; programmable call treatment

T.38 fax relay and fax relay reliability

Time division multiplex (TDM) hairpinning

Programmable interactive voice response (IVR)

Rotary dial peers

Alternate gatekeeper support on the gateway

Multiple redirecting numbers (RDNs)

IP address bind

New resource availability indication (RAI) algorithm

Frame size negotiation

Codec negotiation and support

SIP via user datagram protocol (UDP)

Primary rate interface (PRI)

Call transfer

Call hold

UDP connected socket

Privacy indicator

Mapping PRI within 180/183 SIP messaging

Call control redirect/diversion

Domain name server (DNS)

Codec negotiation and support

Call history

Quality of Service: IP precedence and Priority Queue Weighted Fair Queuing (PQWFQ)

AAA/Radius server

Network side PRI for 5ESS, DMS100, NI2, and NET5 switch types

Voice testing with the Cisco AS5400 and the FastNet interface requires the following configurations:

The config set must be: