I am getting a "513 Message Too Large" is there anything I can do about it?
This is actually covered by the following post, but since SIP messages seem to be getting longer every day this issue comes up a lot and I thought maybe this subject deserved a little extra detail. Here is the post that describes this response code along with several other common codes:
SIP Response codes and their meaning
This was also covered previously in a Field Notice:
The answer is yes, there very well may be something you can do to stop rejecting these large messages. As described in the link above this is the default response sent by the Acme Packet SBC if a UDP message exceeds the 1300 byte maximum size that is defined in RFC 3261. Also mentioned in the above post is that the fix is the sip-config "option" max-udp-length=0. If adding this option does not help you might check to make sure the length of the message is not exceeding the value set in sip-config for maximum SIP message length (sip-message-len). Between