Digium Phone Cannot Provision via DHCP Option 66
Issue:
The provisioning process times out when using DHCP Option 66 with Digium phones. Packet capture shows that SIP messages are being denied with a 401 Rejected message.
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Solution:
Out-of-call messages for DPMA are not set to be handled by Asterisk in sip.conf. Add the lines below to allow the phones to provision:
accept_outofcall_messages = yes
outofcall_message_context = dpma_message_context
auth_message_requests = no
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