The network topology for our configuration is :
One router 2821 with ccme installed and from atm (dsl) interfaces we have VPN tunnels to two remote offices
Each office has a c870 router and 7912 cisco ip phones
We want to activate the crtp compression for network bandwith savings
The configuration for qos in 2821 router is :
class-map match-any voice-signaling
match dscp af31
match protocol sip
class-map match-any voice-udp
description Class Mapping for VoIP RTP
match dscp ef
match protocol rtp
!
!
policy-map voice-qos
description VoIP QoS
class voice-udp
priority percent 50
compress header ip rtp
class voice-signaling
bandwidth 8
class class-default
fair-queue
compress header ip tcp
the policy-map is bound to dialers interfaces
The configuration for qos in each c870 router is the same as above
The output of the ?sh ip rtp header-compression? command for the 2821 router is :
RTP/UDP/IP header compression statistics:
We're compressing using MQC profiles, use the
MQC commands to see the stats for each class.
Interface Virtual-Access2 (compression off, IPHC, NON TCP)
Rcvd: 0 total, 0 compressed, 0 errors, 0 status msgs
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed, 0 status msgs, 0 not predicted
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots,
0 misses, 0 collisions, 0 negative cache hits, 16 free contexts
We're compressing using MQC profiles, use the
MQC commands to see the stats for each class.
Interface Dialer1 (compression off, IPHC, RTP)
Rcvd: 0 total, 0 compressed, 0 errors, 0 status msgs
0 dropped, 0 buffer copies, 0 buffer failures
Sent: 0 total, 0 compressed, 0 status msgs, 0 not predicted
0 bytes saved, 0 bytes sent
Connect: 16 rx slots, 16 tx slots,
0 misses, 0 collisions, 0 negative cache hits, 16 free contexts
Note : in each crypto map in all routers the command (qos pre-classify) is active
As I understand from this output no compression is active
Can you please tell me why this is happening ?
