tshark SIP Statistics

Folks,

Is there to way to get successful vs unsuccessful calls in a given pcap using tshark command line? I am using the example below and get some stats, but would need more. Also, no matter which pcap I use, the average set up is always showing up as 0, what am i missing?(there are definitely a lot of successfull calls in the files i am reading)

tshark -r sharktest.pcap -q -z sip,stat

===================================================================
SIP Statistics
Number of SIP messages: 28
Number of resent SIP messages: 25


SIP Status Codes in reply packets
SIP 200 OK              :    12 Packets


List of SIP Request methods
INVITE          :     4 Packets
BYE             :    12 Packets


Average setup time 0 ms
Min 0 ms
Max 0 ms