IES-1248-51V Support Notes
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2. “Password” is used in SIP authentication while registering. If the
SIP account this profile uses does not require a password for user
authentication, you do not need to configure it.
3. “Do not Disturb” rejects all incoming calls via automatically
reply “486 Busy” message to caller.
4. “Call Hold” service allows user to accept another call on waiting
or transfer to another remote party. Typically, user needs to press
flash button to put remote party on hold or resume conversation. To
enable “Call Wait” and “Call Transfer”, this feature must be active
in advance.
5. “Call Wait” allows the indication of third-party incoming call. If
turn on, the subscriber will be notified with call waiting tone that an
incoming call is waiting, instead of replying “Busy” directly. When
a call awaits, user should decide to (1)reject it, (2)accept it and
terminate original conversation, (3)accept it and hold original
dialogue.
6. “Call Transfer” is a mechanism to transfer current correspondent
to another remote user. After transferring, the two parties can chat.
7. DTMF (digital tone multi frequency) Relay is voice band signal
normally used to identify which dial button is pressed on the phone.
Now IES-1248-51V supports four types of DTMF processing. User
can configure to bypass DTMF signal as in-band voice, relay it as
RFC2833/RFC2833 like (Cisco compatible) RTP packets, or relay it
by SIP INFO messages.
8. Two types of FAX services – bypass FAX signal with G.711
CODEC or relay according to ITU-T T.38. User can configure
which type of FAX service to be used or disable service.
DSP profile
In this configuration operator can define what CODEC to use, how
much the play buffer and echo cancellation period.
1. Currently the available CODECs are G.711a, G.711mu, G.723,
G.726-16, G.726-24, G.726-32, G.726-40, G.729ab. Besides, both
caller and callee need to negotiate a consistent CODEC to be
applied in their voice conversation, thus the order of CODECs mean
the priority of selection.
2. “Echo Tail” provides the echo cancellation period (i.e. 8, 16, 32
and 128 ms) to decrease the acoustic echo arising in circuit or
handset.
3. “Play Buffer Delay” is designed to store the received steaming
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