Users Manual Part 2

13.1.3.3.2
Frame Relay Fragmentation
The status frf command displays fragmentation statistics as show below:
SC) status frf
Transmit Frames fragmented 126
Number of fragments transmitted 12
Number of received frames 4
Number of received fragments 8
Number of ignored fragments 0
Number of discards when disabled 0
If the counter labeled "Number of discards when disabled" is not zero, this indicates that frame relay
fragmentation is disabled on the Site Controller, but enabled on the remote equipment. If however,
there are non-zero values for the counters labeled "Transmit Framed fragmented" and "Number of
fragments transmitted" but the counters labeled "Number of received fragments" and "Number of
received frames" are zero, this would indicate that the remote equipment has not been configured for
FRF.20 frame relay fragmentation.
13.1.3.3.3
IP and Audio
If all is well with the site link, but there are issues with no uplink or downlink audio, the likely culprits are
either the configuration of the UDP port used for voice, the CRTP configuration – or both. A quick
check can be made for crtp activity by typing status crtp.
SC) status crtp
Compressed Frame Count 0
Decompressed Frame Count 99
Contexts Invalidated 1
Tx Context State Packets 0
Rx Context State Packets 0
Tx Full Header Packets 0
Rx Full Header Packets 1
Discards when disabled 0
If the compressed frame count is zero, check the configuration to determine if CRTP is indeed enabled.
If the decompressed frame count is zero, check the CRTP configuration on the core router to ensure
this is enabled, and not set to "passive".
If the decompressed counter is non-zero, it would indicate that the Site Controller is receiving downlink
audio however, the packets are not getting processed for some other reason. It should then be
determined if the IP layer is discarding the received audio packets – this can be a result of not enabling
header extensions with CRTP on the core router.
If there are issues with configuration for CRTP "header extensions", this is indicated by the counter
labeled "UDP datagrams received for unknown ports or with other errors".
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Chapter 13: MTS Troubleshooting
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