[cisco-voip] Incoming calls to filled PRI generating beep and disconnect instead of busy signal

[Joseph Mays]

Okay, so we are generating a PRI an an AS5400 media gateway and delivering it to an IAD2400 at the customer site. There are three channels on the PRI, which is reflected in the trunkgroup status.

controller T1 1/0:19
 framing esf
 channel-group 0 timeslots 1-15 speed 64
 loopback network ignore
 pri-group timeslots 21-24
 description Combo PRI T1 to Allied Aluminum.

interface Serial1/0:19:23
 description PRI to Allied Aluminum
 no ip address
 isdn switch-type primary-ni
 isdn protocol-emulate network
 isdn incoming-voice modem
 trunk-group Allied
 no cdp enable

dial-peer voice 6202 pots
 description ' Analog PBX Trunk Allied Aluminum Products:ALUM-03-BT1-AMP-POTS
 incoming called-number 5025681100
 direct-inward-dial
 forward-digits all
!
dial-peer voice 6203 pots
 trunkgroup Allied
 tone ringback alert-no-PI
 description ' Analog PBX Trunk Allied Aluminum Products:ALUM-03-BT1-AMP-POTS
 translation-profile incoming AddPriServNumPI
 incoming called-number 5025681100
 destination-pattern 5025681100
 direct-inward-dial
 forward-digits all



ArmoryPl-AS5400#show trunk group Allied
Trunk group: Allied
        Description:
        trunk group label: Allied

        Translation profile (Incoming):
        Translation profile (Outgoing):

        Hunt Scheme is sequential both up
        Max Calls (Incoming):   NOT-SET (Any)   NOT-SET (Voice) NOT-SET (Data)
        Max Calls (Outgoing):   NOT-SET (Any)   NOT-SET (Voice) NOT-SET (Data)
        Retries: 3

        Trunk Se1/0:19:23       Preference DEFAULT
                Total channels available : 3
                Data = 0, Voice = 0, Modem = 0, Pending = 0, Free = 3

        Total calls for trunk group: Data = 0, Voice = 0, Modem = 0
                                     Pend = 0, Free = 3


When we make three calls to the customer, everything works fine. All three calls go through as they should and show up as they should.

ArmoryPl-AS5400#show voice call status
CallID     CID  ccVdb      Port      DSP/Ch  Called #   Codec    Dial-peers
0x6B23     2C5B 0x64F5CD00 1/0:1:D.5 No dsp  5025681100 None     6202/6203
0x6B24     2C5B 0x666585D8 1/0:19:D. No dsp *5025681100 None     6203/6202
0x6B25     2C5E 0x64F5CD00 1/0:1:D.6 No dsp  5025681100 None     6202/6203
0x6B26     2C5E 0x666585D8 1/0:19:D. No dsp *5025681100 None     6203/6202
0x6B29     2C62 0x64F5CD00 1/0:1:D.7 No dsp  5025681100 None     6202/6203
0x6B2A     2C62 0x666585D8 1/0:19:D. No dsp *5025681100 None     6203/6202

The thing is, when we place a 4th call, instead of getting the expected busy signal, the AS5400 media gateway gives a beep and disconnect. If no channels are available, shouldn't the media gateway be generating a busy signal? Or do we have to specifically tell it to do that in some way?
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