Features in Release 2.2RN-001029-00, Rev 06, Release 2.2 975i Series IP Phone Release NotesRTP and Multicast RTP via XMLThe IP Phones have new XML commands an Administrator can use with the“AastraIPPhoneExecute” object. These commands allow the phone to send/recieve an RTP stream to/from given multicast/unicast addresses (withoutinvolving SIP signaling). The new XML commands to use with theAastraIPPhoneExecute object in an XML application are:• RTPRx (Receive (Rx) a Unicast RTP stream or stop receiving a Unicast/Multicast RTP streams)• RTPTx (Transmit (Tx) a Unicast RTP stream or stop transmitting a Unicast/Multicast RTP streams)• RTPMRx (Receive (Rx) a Multicast RTP stream)• RTPMTx (Transmit (Tx) a Multicast RTP stream)The phones support the following RTP stream format:• G.711 mu-law CODEC• 20 ms packet sizeNote: If one of the previous commands is sent to the phone which isalready in a call, the phone places the current call on hold and the RTPstreaming commands are performed using a new audio path.