PLANET IPX-1500 - Manual (Page 51)

PBX/PSTN will give IPX-1500 a busy tone automatically. If the other VoIP device of IP side answers
and hangs up the phone, the IPX-1500 will release the line port automatically without analyzing busy
tone from PBX/PSTN.
PBX system advance
There are three parameters received from PBX/PSTN.
Busy tone frequency 1
Busy tone frequency 2
Busy tone sensitive: High, Middle, Low level
Because the different rule and frequency from other countries, parameters have to be properly
configured to recognize busy tone correctly.
Silence detect:
The CO line will be forced to disconnect when there is specific silence (in seconds) on the line.
How to configure busytone on IPX-1500
IPX-1500 has a default setting of busytone (busytone frequency 1; busytone frequency 2 and busytone
sensitive), which is based on busytone of the Taiwan Telecom PSTN network. If the busytone was
recognized correctly, the DSP IC in IPX-1500 will release the line port connected to PBX/PSTN
immediately when detecting of busytone. Otherwise it may be released after one minute or lock this line
permanently. The tone table parameters are shown as following example:
Busytone frequency 1:
480/620: Low frequency is 480 HZ, High frequency is 620 HZ
Busytone frequency 2:
400/450: Low frequency is 400 HZ, High frequency is 450 HZ
Most busy tone of PSTN or PBX is composed by two different frequencies, in Taiwan, for example,
480Hz+620Hz. In such case, you have to assign the two frequency values. But in some area, the busy
tone frequency may be composed by only one frequency; in this case, you have to assign the two fields
with same value. For example, if your PSTN busy tone is single frequency, let’s say 450Hz. Then you
have to fill the two fields with 450/450. The IPX-1500 will recognize them as single frequency.
The IPX-1500 allows you to enter two groups of busy tone setting. Because in many cases.
The gateway has to detect two sources of busy tone. One from PSTN side and the other from PBX side.
So it is necessary to have two groups of setting.
If the IPX-1500 can’t hang up the phone, maybe it is because the PBX/PSTN
Frequency is not the value as default shown as above; you need to adjust Tone Table parameters
51