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+1
Having a similar problem when we're using Kamailio to take a call from carrier 1 and broadcast the call to 2 different agents via carrier 2. If the first branch get's a 486 and the second sends a 183, the 183 results in a PRACK sent by carrier 1, but Kamailio always seems to send the PRACK for the first branch (which no longer exists) to carrier 2 and that results in an error sent back from carrier 2.
As suggested, we also resolved this by removing 100rel from the "Supported"-header.
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