[Serusers] About iptel 400 missing cookie

[Dennis.Cheng]

Hi folks,

I used a Draytek Vigor 2820PBX to register iptel, and I found 400 missing
cookie issue. When my pbx send the reinvite to hold another side, iptel
always responded pbx 400 missing cookie. But I checked invite Via field, its
branch included magic cookie "z9hG4bK". I attached wireshark packets.

BR
Dennis
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