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Are the phones registering to the BCM ?
Excerpt from BCM200/400 4.0 IP Telephony guide: (i series)
Signaling between the IP telephones and the system uses the system port 7000. However, voice packets are exchanged using the default RTP ports 28000 through 28255 at the BCM, and ports 51000 through 51200 at the IP telephones. If these ports are blocked by the firewall or NAT, you will
experience one-way or no-way speech paths.
Excerpt from BCM200/400 4.0 IP Telephony guide: (i series)
Signaling between the IP telephones and the system uses the system port 7000. However, voice packets are exchanged using the default RTP ports 28000 through 28255 at the BCM, and ports 51000 through 51200 at the IP telephones. If these ports are blocked by the firewall or NAT, you will
experience one-way or no-way speech paths.
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