Change Codec

sip-manipulation
        name                           convertCodec
        description                    changeG711toG729
        mime-sdp-rule
                name                           changeCodec
                msg-type                       request
                methods                        INVITE
                action                         manipulate
                comparison-type                case-sensitive
                match-value
                new-value
                sdp-media-rule
                        name                     change711to729
                        media-type               audio
                        action                   manipulate
                        comparison-type          case-sensitive
                        match-value
                        new-value
                        sdp-line-rule
                                name                 change711
                                type                 m
                                action               replace
                                comparison-type      pattern-rule
                                match-value          ^(audio [0-9]{4,5} 
                                                     RTP/AVP.*)( 0)(.*)$
new-value            $1+” 18”+$3
                        sdp-line-rule
                                name                 stripAttr
                                type                 a
                                action               delete
                                comparison-type      pattern-rule
                                match-value          ^rtpmap:0 PCMU/
                                                     .+$
                                new-value                      
                        sdp-line-rule
                                name                 addAttr
                                type                 a
                                action               add
                                comparison-type      boolean
                                match-value          $change711to729. 
                                                     $stripAttr
                                new-value            rtpmap:18 G729/8000