Hi there, PPP link can be configured with STAC/Predictor compression (Layer 2) cRTP compression algorithm to compress UDP packets nameley for voice (layer 3) The problem comes about, when you want to enable both, PPP STAC and cRTP on the same interface. Cisco's IOS accepts both commands, but uses only PPP STAC over cRTP. (cRTP is enabled but does not function : Verified this by sho ip rtp header-compression, and debug ip rtp header-compression) Here is a sample config of the serial interface : interface Serial0/0 ip address 10.1.2.2 255.255.255.252 encapsulation ppp ip tcp header-compression iphc-format no ip mroute-cache compress stac ip rtp header-compression iphc-format Has anyone also had the same problem ?? THANKS IN ADVANCE Aki Christopoulos Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=6121&t=6121 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]

