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DNS setup
The SIP Proxy is configured to serve domains that must be reachable over he Internet. The SIP devices must support RFC3263 (Locating SIP Services), namely support DNS SRV lookups for SIP services. Each domain configured in the SIP Proxy must also exist in the public Internet and be corectly configured in a DNS server responsable for that domain.

You must have a DNS hosting provider for hosting your SIP domains. The DNS provider must support the provisioning of SRV record types specified in RFC3263.
 
The following DNS records are required for the platform to operate: 

SIP Proxy/Registrar 

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; DNS records specified by RFC 3263 (Locating SIP services) ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; SIP communications using UDP transport
example.com.             IN NAPTR  10 0 "S" "SIP+d2u" "" _sip._udp.example.com.
_sip._udp.example.com.   IN SRV    0  0 5060 sipproxy.example.com.
sipproxy.example.com.    IN A      PUBLIC_IP_ADDRESS

;SIP communications using TCP/TLS transports
;example.com.            IN NAPTR  20  0 "S" "SIP+d2t" ""  _sip._tcp.example.com.
;example.com.            IN NAPTR  30  0 "S" "SIPS+d2t" "" _sips._tcp.example.com.
;_sip._tcp.example.com.  IN SRV     0  0 5060 sipproxy.example.com.
;_sips._tcp.example.com. IN SRV     0  0 5061 sipproxy.example.com.

MediaProxy 

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Proprietary DNS SRV records required for MediaProxy selection ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
_mediaproxy._tcp.example.com. IN SRV  10 10  25060 sipmp1.example.com.
_mediaproxy._tcp.example.com. IN SRV  10 10  25060 sipmp2.example.com.
sipmp1.example.com.              IN A       PUBLIC_IP_ADDRESS
sipmp2.example.com.              IN A       PUBLIC_IP_ADDRESS

ENUM

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Delegation for the DNS zone that will hold the ENUM mappings ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
e164.example.com              IN NS      sipproxy.example.com.