I'm using an old 1751V with a VIC2B-NT/TE as ISDN gateway for a IP pbx
My problem is:
When a remote caller calls my phone number through ISDN network , the call is answered by pbx extension . If the remote caller hangs up , the whole call chain (ISDN line--bri port---voip trunk---extension) is disconnected properly.
When a pbx extension places a call to a remote party via ISDN (also to the same phone number that was the caller in previous example) and the voice connection is established, if the remote called party hangs up, the line is not disconnected like before , instead the disconnect tone from ISDN telephon exchange is heard while the whole chain is still up (the call ends for timeout 30 seconds later).
Is this a 1751V configuration problem or a ISDN network one ??
This is my actual (poor) config on 1751V :
no voice call carrier capacity active
interface BRI0/0 no ip address isdn switch-type basic-net3 isdn incoming-voice voice isdn answer1 <myphonenumber>
dial-peer voice 1 voip destination-pattern <myphonenumber> session protocol sipv2 session target ipv4:<mypbxIP> session transport udp dtmf-relay rtp-nte codec g711alaw no vad ! dial-peer voice 11 pots destination-pattern 3T no digit-strip port 0/0 ! dial-peer voice 10 pots destination-pattern 0T no digit-strip port 0/0 ! dial-peer voice 20 pots incoming called-number <myphonenumber> direct-inward-dial !
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