I have been trying to get a Grandstream HT814 to communicate with Sonetel. It works fine when connected directly to the DSL line, but as soon as I put it behind the firewall it stops. It cannot make calls, when receiving a call it will ring, but with no sound.
I have tried with the SIP inspection on and off (in the config below it is disabled)
Hardware: ASA5506, 4096 MB RAM, CPU Atom C2000 series 1250 MHz, 1 CPU (4 cores)
ASA Version 9.8(4)12
no mac-address auto
ip address dhcp setroute
ip address xxxxx
dns domain-lookup inside
dns server-group DefaultDNS
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
access-list outside_access_in extended permit ip any host xxx
access-list inside_access_in extended permit ip any any
access-list global_mpc extended permit ip host xxx any inactive
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
match access-list global_mpc
policy-map type inspect dns preset_dns_map
message-length maximum client auto
message-length maximum 512
policy-map type inspect sip Sonetel
max-forwards-validation action drop log
inspect sip Sonetel
set connection advanced-options tcp-state-bypass
service-policy global_policy global
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