I have a uc500 with bulit in fxo ,,. i have connect to the FXO 0/1/0 an Ericsson Fixed Wirless terminal ... the ericson work like this ( you put a GSM SIM card on it -your mobile SIM for example- then you connect it to fxo port with your CME extention) so when any one dial your mobile number you get it in your ip phone.
one thing the Ericsson terminal can be set to use a multi CLIP standards : like DTMF,Bellcore,V.23
FXO per definition can only receive caller-id, and FXS send it only. Check how your paging system expects to receive calling number, because it cannot be the caller-id method. Are you sure you are not using an FXS port ?
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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