I got a question about the feasibility of transmiting VOIP traffic across the Internet.
The scenario describes as follows:
Branch and the HQ are connected through the Internet.Both of them use the private address in there LANs,and utilize PAT to connect to the Internet.
In the HQ,they will setup a UC demo environment.
The question is "Is it possible to transmit VOIP traffic across the Internet cloud?"
I'm not familiar with Unified Communications.
I would like to clarify this question by asking more detail questions.
1. Does CUCM distinguish IP phone by MAC address or IP address? I find that in the CCM configuration of the IP Phone,the MAC is a must requestion.If the signaling traffic transmits through the Internet,the MAC address is lost,is it?
2. Is SCCP the only protocol that IP phones communicate with CCM to register? Can SIP do that? I saw somewhere says that IP phones can not register by SCCP through WAN,is that correct?
3. If the CCM sees only one IP from the Branch,how to distinguish multiple IP phones in the Branch?
Finally,is it possible to transmit VOIP traffic across the Internet cloud?