Grandstream HT503 User Manual - Manual (Page 57)

FIRMWARE VERSION 1.0.14.1 HT503 USER MANUAL Page 55 of 64
Caller ID Transport Type According to customer’s choice CID information will be transferred from PSTN network
to VoIP network using following rules:
1. via SIP from - PSTN CID is in the SIP From field
2. via P-Asserted-Identity - SIP From field uses the pre-configured account
user Id. PSTN CID is in the P-Asserted-Identity field
3. via P-Preferred-Identity - PSTN CID is in the P-Preferred-Identity field
4. Send anonymous - SIP From field uses "anonymous". PSTN CID is put in the
P-Asserted-Identity field
5. Disable - PSTN CID will not be sent. SIP From field uses the pre-configured
account user ID
Hook Flash Timing The time period when the cradle is pressed (Hook Flash) to simulate a FLASH. Adjust
this time value to prevent unwanted activation of the Flash/Hold and automatic phone
ring-back.
Gain Voice path volume adjustment.
• RX is a gain level for signals transmitted by FXO (FXO-To-VoIP volume ) ,
• TX is a gain level for signals received by FXO( FXO-To-PSTN volume).
Default = 0dB for both parameters. Loudest volume: +6dB; Lowest volume: -6dB.
User can adjust volume of call on either end using the Rx Gain Level parameter and
the TX Gain Level parameter located on the FXO Port Configuration page. These
parameters affects call volume ONLY for calls placed to/from PSTN and VoIP networks.
If call volume is too low when using VoIP extension, adjust volume using the Rx Gain
Level parameter under the FXO Port Configuration page.
If voice volume is too low at the other end (PSTN side), user may increase the far end
volume using the TX Gain Level parameter under the FXO Port Configuration page.
Enable Current
Disconnect
Default is Yes. This value should be used in case the PSTN provider uses line power
drop to indicate call completion to the end point. In this case the HT503 will search for
a power drop for a preconfigured time frame to disconnect such calls from a VoIP
extension.
Current Disconnect
Threshold (ms)
This is a preconfigured value of duration for a line power drop used by specific service
providers. For example, for a configured value of 500ms the device will ignore any
random voltage drops on the line if duration of such drop is less than 500ms and the
call will NOT be considered as terminated. This is useful to prevent unnecessary call
drops in some low quality PSTN lines.
Enable PSTN Disconnect
Tone Detection
If set to Yes, arrived Busy Tone is used as the disconnect signal.
PSTN Disconnect Tone In certain countries, the central office will send a special busy tone to indicate when a
call is disconnected from the remote side. User can pre-configure this tone on the ATA.