Maximum Vendor Specific AV Pairs

Greetings All, I'm running FreeRADIUS version 1.1.7. I notice that sometimes not all vendor specific AV pairs are included in access-accept packets. I suspect that this is because I am hitting the maximum packet size of 4096 bytes. However, some of the information I've read tells me that there is no limit on the VSAs that can be included in an access-accept packet. Which is it? I've run the server in full debugging mode and there is no output relating to dropping attributes from the access-accept packet. All the best!