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Universal Network Terminal TAU-32M.IP
100rel, perform reliable transfer of provisional replies. If there is no supported: 100rel tag in INVITE
request, the gateway will perform unreliable transfer of provisional replies;
–
off
–when the following tag is received in 'INVITE' request–required: 100rel, reject the request with
message 420 and provide the following tag–unsupported: 100rel. Otherwise, perform unreliable transfer of
provisional replies.
5.1.2.2.3.2
Configuration of Internal Switching for SIP-proxy Connection Loss
In order to perform intra-office calls when connection to SIP-proxy is lost, you should specify TAU-24.IP/TAU-
16.IP gateway IP address as the last SIP-proxy. In this case, the
Proxy mode
must necessarily be
homing
, otherwise,
after the connection with the main SIP-proxy is restored, it will never return to it.
5.1.2.2.3.3
SIP domain configuration via local DNS
In the current firmware version, it is possible to configure SIP domain using a local DNS. This option may
become useful, for example, when you use redundant SIP-proxies in different domains.
SIP domain configuration order for 'n' profile:
1.
To use a local DNS, leave DNS field in
'Network/Network settings'
tab blank or enter the value 127.0.0.1;
2.
In
'Network/Hosts'
tab, enter the mapping of a host (SIP domain) to actual IP addresses of SIP proxy/SIP
registrar;
3.
In
'PBX/SIP-H323 Profiles/Profile n/SIP Custom'
tab,
specify domains for each pair of SIP proxy and SIP
registrar;
4.
Enable routing via SIP proxy by selecting
outbound
checkbox in
'PBX/SIP-H323 Profiles/Profile n/SIP
Custom'
tab,
or entering prefixes in 'PBX/SIP-H323 Profiles/Profile n/Dialplan (Dialplan table)'
tab.
If you
configure prefixes, select SIP proxy protocol in
'Protocol&Target' field
.
5.1.2.2.4
Codecs Configuration (Profile n/Codecs)
In the
'Profile n/Codecs'
submenu, you may configure codecs used in the current profile.
Devices signal processor encodes analogue voice traffic and fax/modem data into digital signal and performs
its reverse decoding. Gateway supports the following codecs: G.711A, G.711U, G.729, G723.1, G.726-32.
G.711
is PCM codec that does not employ a compression of voice data. This codec must be supported by all
VoIP equipment manufacturers. G.711A and G.711U codecs differ from each other in encoding law (А-law is a linear
encoding and U-law is non-linear). The U-law encoding is used in North America, and the A-law encoding – in
Europe.
G.723.1
is a voice data compression codec, allows for two operation modes: 6.3kbps and 5.3kbps. G.723.1
codec has a voice activity detector and performs comfort noise generation at the remote end during period of
silence (Annex A).
G.723.1 codec is used together with 'Silence compression' setting. When the setting is enabled,
Annex A support is enabled, otherwise it is disabled.
G.726-32
is a voice data compression codec that uses ADPCM compression algorithm at the rate of 32kbps.