How to set clocking for PSTN Router and Branch Routers Example using MGCP gateway: ! ! Question: > Take clocking for Layer 1 from Network side. -->Means PSTN is Network Side > Your PRI clocking of layer 2 should be user side. -->Means Branch takes > clock from PSTN ! ! PSTN ROUTER network-clock-participate wic 1 controller T1 0/1/0 clock source internal linecode B8ZS framing ESF pri-group timeslots 1-24 clock source internal <Makes PSTN the Network Side> description ** T1 PRI Voice Connection To: S0/1/0 BR1-RTR ** ! ! interface Serial0/1/0:23 description ** T1 VOICE CONNECTION TO S0/1/0 BR1-RTR ** no ip address encapsulation hdlc isdn switch-type primary-ni isdn protocol-emulate network <Makes PSTN the Network Side> isdn incoming-voice voice isdn negotiate-bchan resend-setup isdn outgoing display-ie isdn outgoing ie redirecting-number no cdp enable ! ! PSTN#show controller t1 0/1/0 T1 0/1/0 is up. Framing is ESF, Line Code is B8ZS, Clock Source is Internal. ! ! BRANCH ROUTERS USING T1 MGCP isdn switch-type primary-ni network-clock-participate wic 0 network-clock-select 1 T1 0/1/0 controller T1 0/0/0 pri-group timeslots 1-24 service mgcp clock source line <Makes Router the user Side gets clock from PSTN> linecode B8ZS framing ESF description ==VOICE PRI== ! ! interface Serial0/1/0:23 no ip address encapsulation hdlc isdn switch-type primary-ni isdn incoming-voice voice isdn bind-l3 ccm-manager isdn send-alerting isdn sending-complete isdn outgoing display-ie isdn outgoing ie redirecting-number no cdp enable ! ! BR1-RTR#show controller t1 0/1/0 T1 0/1/0 is up. Framing is ESF, Line Code is B8ZS, Clock Source is Line. ! ! !Hope this helps clarify the clocking issues and configuration. ! ! Michael Sears, CCIE(V)#38404 "Designing and Implementing Cisco Unified Communications on Unified Computing Systems"
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