We have an odd issue affecting two known phones, both GXP 2170s, for calling out.
About half the time, when either phone calls out, a 6994 is added to the front of the call, and the call connects elsewhere.
However, tracing these calls have been eluding me. Only the phone’s call history, (Edit:) and phone’s display during the call, shows the 6994 added, while the FreePBX Asterisk system does not (logs and CDR), which show the number exactly as it should, both when called correctly (without the 6994 randomly appearing) and when 699 is prefixed at the beginning. I’ve checked with our VOIP provider, and the CDR reports reflect the FreePBX’s logs as well, no 6994 prefixed.
Reviewed outbound routes and trunks (outbound VOIP, inbound analog, with fail over to analog, no mention of 699, just 8 to push calls out analog and skipping VOIP).
After having two sets of eyes reviewing the setup on one of the phones, we factory reset it, added the only extension, speed dials (none of which used when dialing), VLAN, header name for unique ringtone (transferred calls), and the DND’s feature code.
The Grandstream is on 220.127.116.11
PBX Firmware: 10.13.66-18
PBX Service Pack: 18.104.22.168
Other than the phone’s call history, I can’t find 6994 listed anywhere else.
Edit: Minor correction, 6994, not just 699.