I have one CME support 48 IP phones and I want to extended without replace it with higher one, I buy another CME same model number support 48 IP phone, what I did is split the phone line to two one going to old one and the other going to new one, when some one call both CME will ring, but what I need is how can I transfer the extinction 1111 on old one to 1222 to new one if both connect through UTP cable.
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Recommend or not all depend on your particular scenario. It is quite normal to share one or more PSTN gateways in an enterprise environment.
You have one small site and are using POTS lines for PSTN connection. How many lines do you have? It may not have enouogh capacity to handle incoming and outgoing calls for more than one CME.
Here is a link you can use for connecting multiple CME's http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/srnd/design/guide/multcme.html
Hope this is helpful.