You will need to capture the SI, Tel and voip traces from the PIMG. Along with the Unity Macro call Control Traces for SIP. This will show you what is coming in from the Ericsson and what unity is receiving.
Also ensure you have downloaded the latest firmware for you pimg. 80ls_v5.1su3.zip is the file you need.
This is just a guess but a common problem with serial integrations is in linking data packets with physical ports on PIMG. In your above examples, I believe the last three digits are providing the port number. Looks like the first and third represent calls that hit the same port, 025. The second one goes with a call that hit a different port, 033. So for example if the first and third calls hit port 1 on your PIMG then you need to ensure the PIMG knows 025 is the Logical Extension Number of that port. See Table 11-5 of Cisco's Configuration Guide: http://www.cisco.com/en/US/docs/voice_ip_comm/unity/5x/integration/pimg/guide/cuintpimg070.html#wp1113792
BTW to answer your specific question... looks like your CPID Length is 5 and your Voice Mail Port Len might be 3.
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