packet loss and network issues - wireshark

[Raghul Prasanna <raghul82 () yahoo co uk>]

Hello,
 
Sorry if its a simple question, I am bit new to wireshark.
 
I am trying to find out network issues, because the audio quality is bad during peak hours. When I capture on an 
interface and do stream analysis of RTP stream I see some streams showing more than 70% packet loss.
 
When I capture on an inteface I believe the wireshark captures audio in both the directions and I believe wireshark 
detects packet loss based on transport layer protocol, in my case UDP.
 
Strem analysis of one such stream shows lots of wrong sequence number, which would again indicate packet loss. But what 
I am failing to understand is where is wireshark getting the sequence number, because UDP doesnt have any sequence 
number, then is it the RTP packet number?
 
How would wireshark know packet loss in TX direction based on packet loss, because I see packet loss for streams going 
from my interface to the far end?
 
MAX Delta - Is this max gap between packets for a stream? If so what will be the best value?
 
Thanks,
Raghul

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