[SR-Users] Determining size of INVITE

[Daniel Tryba]

How can I get the determine the total size of an outgoing INVITE?

The size of the body is $bs, but is there a way to get the size of all 
headers? Based on the size of the total request I have to chose between UDP 
and TCP, upstream provider requires IP packets>1300 to be transmitted over 
TCP. 

Is there an easy way (like $bs) or should I just call msg_apply_changes() and 
loop through all headers and sum the lengths of them?

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