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Cordless phone via voip

Hi,

When I use a cordless phone via PABX to make voip H323 call from China to Hong Kong, there is some problem as follows. Can anyone know what the problem is in "B"

A. Normal connection - successful

Press " Call "

Press xxxxxxxx

B. Failed connection - sometimes get busy tone

Press xxxxxxxx

Press " Call "

-----------------------------------

controller T1 0/0/0
framing esf
linecode b8zs
cablelength short 110
ds0-group 1 timeslots 1-12 type e&m-immediate-start

dial-peer voice 11 pots
description ## To HZ Office ##
destination-pattern 86
port 0/0/0:1
!
dial-peer voice 101 voip
description ## To HK Office ##
destination-pattern 82[1-8]T
translate-outgoing calling 1
voice-class h323 1
session target ipv4:57.207.243.183
dtmf-relay h245-signal
codec g729r8 bytes 40
fax-relay ecm disable
fax rate 7200 bytes 48
fax nsf 000000
  fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco

-----------------------------------------------------------

Thanks

Leung Che Man

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