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8620 connect Harris’s switch through PRI, and only one PSTN terminal can join the conference.

Publication Date:  2012-09-28 Views:  199 Downloads:  0

Issue Description

8620 hangs one video terminal, the opposite sides are several PSTN phones under Harris switch (PSTN); we need to realize video terminals and PSTN phone in one conference. PSTN switch is connected by PRI(30B+DISDN ports), after setting, user operates conference by local management platform. Find out that there is only one PSTN phone can join the conference, other PSTN phone call the number and the phone is busy.

Alarm Information

Other phone can’t call to join the conference except one PSTN phone.

Handling Process

1. Find out there is no problem on the PRI line, then check PRI port setting, port chooses PRI, and the port configuration on Local management platform is:
a. number of out(select)
b. number of out input(the call number when terminal enters the conference need)
c. User side of type DSS1 and DSS1 network side (both side can choose the different)
2. Virtual dial on switch with PSTN phone, still can’t join the conference, hang up the PSTN phone that has joined the conference, and there is only one other terminal can join the conference, judge the problem may be on meeting place setting.
3. Check the conference configuration: Meeting place should be defined as PSTN not ISDN, if we want certain PSTN phones in one conference, local management platform must add corresponding meeting places, and the conferences number should be the same as the real number. That is because user only set one PSTN meeting place; causing other meeting place can’t join the conference, the solution is add other PSTN meeting place on local management platform, find out the dialing is still busy. Remember that other terminals use virtual dial. Let user turn off the virtual dial function, other terminals can join the conferences normally.

Root Cause

1. Line problem
2. Port setting problem
3. Meeting place setting problem


We can’t define switch as a big terminal when using PRI connect PSTN net and set only one meeting place. In fact, the terminals set on LM should correspond each PSTN phone.