LTE TDD B2268H
User Guide
13 VoIP
Issue 01 (2014-01-15)
Copyright © Huawei Technologies Co., Ltd.
96
LABEL
DESCRIPTION
the Provisional Response ACKnowledgement (PRACK) method.
Select
Supported
or
Required
to have the LTE Device include a SIP
Require/Supported header field with the option tag 100rel in all INVITE
requests. When the LTE Device receives a SIP response message
indicating that the phone it called is ringing, the LTE Device sends a
PRACK message to have both sides confirm the message is received.
If you select
Supported
, the peer device supports the option tag 100rel to
send provisional responses reliably.
If you select
Required
, the peer device requires the option tag 100rel to
send provisional responses reliably.
Select
Disabled
to turn off this function.
DNS SRV
Enabled (RFC
3263)
Select this option to have the LTE Device use DNS procedures to resolve
the SIP domain and find the SIP server's IP address, port number and
supported transport protocol(s).
The LTE Device first uses DNS Name Authority Pointer (NAPTR)
records to determine the transport protocols supported by the SIP server.
It then performs DNS Service (SRV) query to determine the port number
for the protocol. The LTE Device resolves the SIP server's IP address by
a standard DNS address record lookup.
Session Timer
(RFC 4028)
Select this to have the LTE Device support RFC 4028.
This makes sure that SIP sessions do not hang and the SIP line can
always be available for use.
RTP Port Range
Start Port
End Port
Enter the listening port number(s) for RTP traffic, if your VoIP service
provider gave you this information. Otherwise, keep the default values.
To enter one port number, enter the port number in the
Start Port
and
End Port
fields.
To enter a range of ports,
Enter the port number at the beginning of the range in the
Start Port
field.
Enter the port number at the end of the range in the
End Port
field.
DTMF Mode
DTMF Mode
Control how the LTE Device handles the tones that your telephone
makes when you push its buttons. You should use the same mode your
VoIP service provider uses.
RFC2833
- send the DTMF tones in RTP packets.
PCM
- send the DTMF tones in the voice data stream. This method
works best when you are using a codec that does not use compression
(like G.711). Codecs that use compression (like G.729 and G.726) can
distort the tones.
SIP INFO
- send the DTMF tones in SIP messages.
Transport Type
Transport Type
Select the transport layer protocol
UDP
or
TCP
(usually UDP) used for
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