Grandstream Networks GXE502X User Manual
Page 12
GXE502X User Manual 7/9/2008
12
Version 03
In the Internal Phone/Fax Port section, the electrical and DTMF signaling settings of the
two FXS ports on the back of the GXE502X can be configured for compatibility with local
analog phone/fax devices. The extension numbers for these ports are set in the Phone
Extensions menu, under the General Settings sub menu section.
• DTMF Transport Type: This field is used to specify the method of sending DTMF digits
to the VoIP side. There are three possible options: in-band(audio), via RTP(RFC2833),
or via SIP INFO. It is possible to select several methods. For example:
ch1:T=<2833/audio/signal>;ch2:T=<2833/audio/signal> . Default: ch1-2:T=2833.
• SLIC Setting: subscriber line interfacing circuit configuration. This field should be
configured based on local Telco standard and analogue phone/fax type.
• Caller ID Scheme: The following schemes are currently supported: Bellcore/Telcordia,
ETSI-FSK, ETSI-DTMF, SIN 227 – BT, & NTT Japan.
• Polarity Reversal: If set to “Yes”, the polarity will be reversed upon call establishment
and termination, this is usually used for billing purposes. The Default is No.
• Current Disconnect: If set to “Yes”, this feature will use a momentarily voltage drop to
signal remote party disconnects.
• Current Disconnect Duration: A configurable time threshold where the FXS port will
drop off voltage on the line to indicate to the local party that the call is disconnected
from the remote side. (100-10000 ms. Default 200 ms)
• Hook Flash Timing: The time period when the cradle is pressed (Hook Flash) to
simulate a FLASH. Adjusting this time value correctly can prevent unwanted activation
of the Flash/Hold and automatic ring-back.
When finished, click on the Submit button to save your changes.
- SIP trunk