I have several types of IP phones on my PIAF 17552 installation. All function properly. The Nortel phones function properly, with one exception; when calling cellular telephones from the Nortel1535 phones the Nortel's continue to ring, even after the cell phone is answered. The Nortel phone shows that it is connected, and terminates when the cell phone user hangs up. I did a SIP show channels command during a call, and both ends show ulaw as the codec. ulaw is the only codec defined on the Asterisk trunk, and the Nortel phones. If a cell phone calls the Nortel phones, they function properly. Does anyone have any ideas as to how to fix this?
Thank you. Bob
Thank you. Bob
Phone System 