Voice over IP (VoIP) SIP Telephony
121
The Aastra 673xi/675xi SIP telephones provide, besides the VoIP telephony, addi-
tional system telephony features which you can configure conveniently and safely
with the help of the Web configurator. The Aastra 673xi/675xi SIP telephones
support G.711 codec (a-Law and µ-Law), the G.729 codec and the transmission of
DTMF signals according to RFC 2833. An MGW Interface Card is required to operate
Aastra 673xi/675xi SIP telephones with the OpenCom 100 communications
system. As an additional requirement, a memory card with 256 Mb or more must
be installed. This will provide the necessary memory space to store the firmware
files for the varying Aastra 673xi/675xi SIP telephones.
The general commissioning takes place in the Configurator of the OpenCom 100
communications system with the following steps:
1. Under System: Licences, activate the SIP system devices (see also Internal SIP
Subscribers starting on page 117).
2. Under System: Components load the firmware addons to the memory card.
3. Add a new entry under Telephony: Devices: VoIP Phones. Enter a call number
and select the telephone type as Aastra 673xi/675xi. Optionally enter the MAC
address and the IP address of the Aastra 673xi/675xi (see Aastra 673xi/675xi
DHCP starting on page 124).
4. Under Telephony : Devices: System phones configure the common settings,
the programmable keys and the softkeys for the Aastra 673xi/675xi (see
Aastra 673xi/675xi Setup starting on page 122).
5. Connect the Aastra 673xi/675xi to your network and plug in the power supply.
Details about this can be found in the installation manual which is provided
with the Aastra 673xi/675xi.
Aastra 6755i Model with illuminated comfort display, 802.3af (PoE) power
supply, two Ethernet ports for PC and LAN, 6 programmable
keys and 6 softkeys, 4 line keys, up to 3 key extensions with
function keys or 3 key extensions with softkeys
Aastra 6757i Similar to Aastra 6755i, but with illuminated premium display
which provides space for 12 softkeys
Aastra 673xi and Aastra 675xi SIP telephones
Model Short description
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