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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!
**Restrict Source IP
**Direct IP calls
**Accept SIP Trust Server Only eg, [[VoIP_Phones_-_Yealink_DECT#Other_optional_settings
**Allow Incoming SIP Messages from SIP Proxy Only [[VoIP_Phones_-_Grandstream_HT8xx#Ghost_calls?
* Also review your [[VoIP Security|Firewall]], and check you're only allowing VoIP traffic from the A&A servers.
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