Inbound Dial Peer leg matching order
When a voice gateway receive a call , you can divide your call in an inbound and outbound leg. Let’s see how the inbound priority matching . incoming-called-number (called number...
read moreHow to preserve H323 Calls in a WAN failure
During WAN failure , we can observe that H323 will not preserve absolutely the call when the failover occurs as there is no more any signal from the CUCM. An unofficial workaround is to use the...
read moreRTP Ports
Hi , RTP ports are used on top of UDP to carry on the voice payload/traffic. The common range of ports are 16384 and 32767 .
read moreHeader
Depending the Layer 2 technology that you use , the header can change : Ethernet Frame             => 18 bytes Frame Relay/FRF.12        =>  6 bytes MLP => 6 bytes 13 bytes ATM =>...
read moreVPN Overhead
Please , don’t forget also that VPN mechanisms add a lot of overhead to your voice packets and it depends also of the technology that you deploy (L2TP for Layer 2 or IPSEC for Layer 3). So as...
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