Cisco Cisco Agent Desktop 8.5 Referências técnicas
Deployment Issues
November 26, 2013
37
, only the audio streams exiting the IP phone's switch port
are copied to the SPAN destination port. Alternately, the SPAN can be configured to
capture only ingress traffic. In that case, streams 1 and 4 are copied to the VoIP
Monitor server.
capture only ingress traffic. In that case, streams 1 and 4 are copied to the VoIP
Monitor server.
This situation can occur for SPAN configurations using VLANs for sources and for
RSPAN configurations. Any time that two or more phone devices (including soft
IP phones) are part of the same SPAN configuration delivering audio data to a single
VoIP Monitor service, it will see duplicate audio packets and result in poor audio
quality for recording or monitoring.
RSPAN configurations. Any time that two or more phone devices (including soft
IP phones) are part of the same SPAN configuration delivering audio data to a single
VoIP Monitor service, it will see duplicate audio packets and result in poor audio
quality for recording or monitoring.
This is an important aspect to understand because it has ramifications for switch
configuration and the number of VoIP Monitor servers required for a Cisco software
installation.
configuration and the number of VoIP Monitor servers required for a Cisco software
installation.
SPAN configurations are something that are set up once and not changed very often.
If we take the network layout shown in
If we take the network layout shown in
, with SPAN configured to use VLAN
100 for the source ports, and capturing both ingress and egress packets, calls
between phone 1 and phone 2, or phone 1 and phone 3 will sound bad due to
duplicate packets, but calls between any of the phones and external callers will sound
good.
between phone 1 and phone 2, or phone 1 and phone 3 will sound bad due to
duplicate packets, but calls between any of the phones and external callers will sound
good.
If we change the SPAN configuration to capture only egress packets, calls between
the phones will sound good, but calls between a phone and an external caller will only
contain a single audio stream (the To-Agent stream). This is because only the audio
the phones will sound good, but calls between a phone and an external caller will only
contain a single audio stream (the To-Agent stream). This is because only the audio
Figure 16.
Capturing egress-only traffic for two devices in the same SPAN configuration