Generally this is limited practically by the mtu. The spec states that a UA MUST be able to receive a full 64k sized udp packet, but when sending, if it is over the mtu it should switch to tcp instead of udp. Furthermore, when sending a request, if it is over 1200b it should send as tcp to allow for a larger response to that request to still fit within the mtu and not get fragmented udp.

Mike

On Sep 11, 2008, at 9:10 AM, Fan Xing wrote:

Anyone knows the maximum size of an sip text message?  /Xing

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