To resolve this issue, determine the cause of the delay and try to eliminate it.
The causes of drops or delays in a packet telephony network can be numerous and varied.
These are common examples:
Misconfigured Low Latency Queuing (LLQ)
Misconfigured fragmentation for low speed links
Misconfigured traffic shaping or Frame Relay Committed Information Rate (CIR) being exceeded
Links with over committed bandwidth in the path of the call (for example, Poor Connection Admission Control [CAC] for voice calls). A simple example would be a G.711 call with no Compressed Real-Time Protocol (CRTP) or Voice Activity Detection (VAD) across a 64-Kbps link.
Duplex mismatches in an Ethernet environment
CPU intensive operations on a router in the path of the call. For example, debugs to a console or saving the router configuration can cause high CPU utilization that delays packets traversing it.
The packet duplication could be because of the way you have configured SPAN in the switch to capture the packets.
For example, if you have a phone connected to fastethernet 1/1 on the switch and the uplink port on the switch is gig 1/0, and you configure SPAN to capture packets on both fastethernet 1/1 and Gig 1/0 in both directions (TX and RX), this could lead to duplicate. The reason being that, the switch will forward to the SPAN port the packet coming in the RX direction in fast 1/1 and also the packet in the TX direction in Gig 1/0 .
To resolve this issue, configure SPAN to either do the capture on the phone ports or on the uplink ports. It is better to do so on the phone ports so that you can see the packets on calls between phones connected to the same switch.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...
You have reached the Cisco Logistics Support Center.. To Check Status of your RMA, visit Product Returns & Replacements (RMA).
Need help? Contact us by Phone or Email.
Phone: 1800 553 2447 Option 4