IP PBXs USER MANUAL
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Transport Protocol
: The transport protocol to be used by SIP signaling. By default it uses UDP protocol, if you choose to use TCP or
TLS please make sure the SIP IP phone or softphone uses the same protocol. Otherwise you
’
ll get
“
403
”
error on SIP register.
DTMF Mode
: Defines how the system detects DTMF tones, the default setting is RFC4733, it can be changed if necessary.
SRTP
: Secure Real-time Transport Protocol (SRTP) encrypts the RTP traffic to secure your VoIP phone calls. Before enabling this
option you need to ensure the SIP endpoint can also support SRTP.
Qualify (S)
: The IPPBX system sends a SIP OPTIONS command regularly to check if the device is still online.
NAT Support
: Enable this option if extension user or the phone is behind a router.
IAX Extension
: Enable this option to activate IAX protocol support.
Permit IP
: Defines which IP address or network address (either private IP or public IP) is allowed to register to this extension,
register coming from other addresses will be dropped.
Qualify Timeout (S)
: If a qualify message is not responded by the SIP endpoint within the
“
Qualify Timeout
”
, IP PBX system will
consider the endpoint offline.
Send PAI
: Send the P Asserted Identity header. The P-Asserted-Identity contains the caller id information for the call on the INVITE
SIP packet. Send the remote Party ID header. PAI and RPID are mutually exclusive you can set one or the other but not both.
Send RPID
: Send the Remote Party ID header. PAI and RPID are mutually exclusive you can set one or the other but not both.
RTP Timeout
: RTP timeout can be used to automatically hangup the call if no RTP traffic is received within 60 (default) seconds.
Inband Progress
: Set whether to send the ring tone via voice streaming.
Available Codec
: IPPBX system supports the following audio codecs G.711 (ulaw, alaw), G.722, G.726, G.729, GSM, Opus and Speex.
You may choose the appropriate audio codecs from the
Available Codec
column and click to add to
Selected Codec
column.
Selected Codec
: Audio codecs you chose will be added here. The sequence of the audio codecs listed here is the sequence of the
audio codecs to be used for negotiating the media of a phone call to be established.