ATCOM 5520 User Manual page 36

Busy：If the phone is busy, incoming calls will be forwarded to the
appointed phone.
No answer： If there is no answer, incoming calls will be forwarded to the
appointed phone.
Always: Incoming calls will be forwarded to the appoint phone directly. The
phone will prompt the incoming while doing forward.
Forward Phone Number: Appoint your forward phone number.
Server Type: Select the special type of server which is encrypted, or has
some unique requirements or call flows.
DTMF Mode: Select DTMF sending mode, there are three modes:
DTMF_RELAY
o
DTMF_RFC2833
o
DTMF_SIP_INFO Different VoIP Service providers may provide
o
different modes.
RFC Protocol Edition: Select SIP protocol version to adapt for the SIP
server which uses the same version as you select. For example, if the
server is CISCO5300, you need to change to RFC2543; else phone may not
cancel call normally. System uses RFC3261 as default.
Transport Protocol: Set transport protocols, TCP or UDP.
Subscribe Expire Time: Overtime of resending subscribe packet. Suggest
using the default config.
Conference Number: config certain Conference call number.
Signal Encode: enable signal encryption.
Rtp Encode: enable voice data encryption.
Enable Session Timer: enable rfc4028 to refresh the SIP sessions.
Answer With Single Codec: only answer the call with a certain Codec.
Auto TCP: enable TCP transmission protocol when the length of message
exceed 1300 byte.
Enable URI Convert: convert # into %23 when sending URI.
Enable Display name Quote: Set to make quotation mark to display
name as the phone sends out signal, in order to be compatible with server.
Enable GRUU: Set to support GRUU.
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