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By default, all of our SIP signaling has been done over UDP in the past.  As more features in the VOIP space get added, SIP packets are becoming inherently larger in size.  The RFC recommendation is to not fragment UDP SIP packets and to ensure anything over 1480 bytes is sent using an alternative protocol.  In our instance we have implemented the ability to change individual devices and accounts over to TCP signaling in order to alleviate any issues we see around UDP packet fragmentation.

This article will show you how to do the following.

  • Adjust the Transport settings on the Account and User/Device levels.

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