D cisco codec fax ack Cisco codec fax ack cisco codec - fax ind Cisco codec fax indication cisco - codec gsmamrnb Cisco codec GSM AMR Narrow Band cisco codec ilbc Cisco codec iLBC cisco - codec - video - h263+ RTP video codec H263+ payload type cisco codec -video-h264 - - RTP video codec H264 payload type cisco fax relay Cisco fax relay cisco - pcm - switch-over-alaw Cisco RTP PCM codec switch over ind -law) cisco pcm switch-over-ulaw Cisco RTP PCM codec switch over ind (u-law) cisco-rtp-dtmf relay cisco-rtp dtmf relay comfort - noise RTP comfort noise payload type g726r16 Using dynamic payload for g726r16 in H323 - SIP interop g726r24 Using dynamic payload for g726r24 in H323 - SIP interop lmr-tone Land Mobile Radio Tone Event Named Signaling Event Named Telephone Event nte tone Named Telephone Tone Event Codec Filtering or Stripping The term codec filtering or codec stripping denotes a network border function in which the list of valid codecs that can be negotiated by the endpoints on a call are limited or manipulated. Figure 8-3 shows how the CUBE can provide a codec filtering function. The incoming dial-peer on the left is configured as codec transparent that enables all codecs offered by the endpoint. The outgoing dial-peer on the right, however, lists G.711 explicitly, and therefore the outgoing H.323 or SIP call setup contains only G.711 as a codec offer. The terminating endpoint on the right can support more than G.711, but because G.711 is the only codec offered to it, it accepts the call with this codec. Chapter 8: Interworking 153 Incoming Dial-Peer Outgoing Dial-Peer dial-peer voice 919 voip dial-peer voice 9190 voip incoming called-number 919 Codec Filter destination-pattern 919 session target ras session target ras codec transparent codec g711 ulaw g711ulaw, g726r32 g711ulaw Originating Terminating Endpoint 1st Call Leg 2nd Call Leg Endpoint g711ulaw, g726r32, (H.323/SIP) (H.323/SIP) Codecs: g7xx-non-std g711ulaw, g726r32 g711ulaw g711ulaw Cisco Unified Border Element Figure 8-3 Codec Filtering Exam