Hi I have registered three 3rd party sip devices to my cucm 12.51- grandstream 33802-grandstream 26133- Huawei espacethey are all registered. calls between grandstreams 3380 and Huawei is working fine. my issue is with grandstream 2613 which can call...

I have Cisco Router ISR4321 with inbuilt 4GB Ram and flash. I need to upgrade it to 8GB. Should i add 4GB or 8 GB ??

voice service voip  allow-connections h323 to h323  allow-connections h323 to sip  allow-connections sip to h323  allow-connections sip to sip  sip voice class codec 1  codec preference 1 g711alaw  codec preference 2 g711ulaw ! voice register global ...