Traffic to tcp/5060 is being blocked - probably by a firewall. The phone sends a SYN. Call manager sends a SYN ACK back. The phone should transmit an ACK back - but it never does. This suggests that the phone never got the SYN ACK - or the ACK response was filtered. My guess is the phone never got the SYN ACK - because something between the packet capture point and the phone blocked it. From here you could try changing the configuration to not use tcp/5060, change to using a 100% encrypted connection, or do more packet captures to isolate the point where the SYN ACK goes "missing".
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