It looks like The Mitel box is rejecting the registration from the MBG:
(I've registered the MAC address on the MBG and set the 5320 up as a teleworker using the 7 key with the MBG address)
On the Mitel:
Unusual SIP Registration Activities, 217840 '404 Not Found' responses.Registration to sip:6134@10.xx.xxx.xx:5060/sip:6134@10.xx.xxx.xx:5060 was just attempted by SrcIP[10.xx.xxx.xx:5060] ViaIP[10.xx.xxx.xx:5060] ContactIP[10.xx.xxx.xx:5060]. Since the last log there have been 1 other log requests for 'not found' failures. If this is not an address you recognize please change your firewall to block this address
On the Phone:
L2 DL error (after TFTP: main has downloaded to 1466)
On the MBG:
Set Connection - Rejected
Acceptor:Plaintext-UDP, ID:99bc87173eb6277d21ac0b2035533a104623, Ip:yyy.yyy.yyy.yyy:5072, Icp:zzz.zzz.zzz.zzz, active-connections:1, LocalIp:yyy.yyy.yyy.yyy, Type:SIP, Reason: rejected by ICP (code 404), persistent:0
Does anyone know How / Where I tell the Mitel that the registration is to be expected & valid ?
Kind Regs,
Rob.