IP Telephony and Phones

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Hi,  we are facing issues with registration about Cisco IP phone CP 7821 with CIsco router 2921。 The IP phones are on the branch and CIsco router 2921 are on the headquarter.There is an WAN dedicated line between the branch and the headquarter。 We ha...

gushuhua by Level 1
  • 603 Views
  • 8 replies
  • 1 Helpful votes

Hello,So we have two gateways at our main office that are feed from our NOC provider for VOIP services. Both Gateway 1 and 2 are 4331.We started getting wierd issue with some of our DID at our building locations were not recieving calls. However dial...

rtarson by Level 1
  • 392 Views
  • 3 replies
  • 1 Helpful votes

Hello,I ran into an issue with ATT PRI and hope someone can shed some light.We have a ATT PRI connected to a Avaya PBX and we are going to migrate the legacy system to our centralized CM cluster.  I configred a Cisco 2951 ISR router running MGCP.  I ...

markcarat by Level 1
  • 1629 Views
  • 8 replies
  • 0 Helpful votes