UCM6208 sip out fails in bound works


Here is my firewall rules and a dump.

Worked with the sip provider who says they send back a 407 and the grandstream doesnt see it (dump). What is my next move, battled this hard.

fixed. the MTU was to small. Ran a dump on the outbound calls saw it was dropping part of the packet wehn sending to known traffic


Hello asweet,

Could you provide some more details?


mtu was to small worked on this for hours.