The History of VoIP
Voice over Internet Protocol, abbreviated VoIP, is a fairly recent technology. It goes by many names, including Voice Over Broadband (VoBB), Internet...
Even though we have used it in the past, we would not recommend it for professional use.
However, please try the below configuration (update the bold...
Elastix – PBX:
1.Select – Trunks – Add Sip Trunk
Trunk Description: PSTN
Outbound Caller ID: YOUR PHONE NUMBER
CID Options: Allow any CID
Maximum Channels: 1
Which Cisco 79??. It could be a later model, which you could flash it so as to use SIP.
Anyway, try the below:
1. Download and install sccp, Chan_SCCP.
The NAT configuration can be found in /etc/asterisk/sip_general_custom.conf (on elastix, at least) and not in sip.conf as stated in other forums. Do not edit sip.conf.
For Greece, OTE, the signalling is ptmp.
Hence, the configs below apply for ISDN BRI B400P and TDM400P PSTN:
Span 1: B4/0/1 "B4XXP (PCI) Card 0 Span 1"...