Datasheet

CHAPTER 1
About H.323
4 Vpacket 5100/6100 Series H.323 Telephony
Note. Vpacket strongly recommends that you use the supplied coding profiles listed in
Appendix D for initial configuration and system tests. Only when network quality
characteristics have been benchmarked and systematically tested, you can proceed
with customizing them.
Coding profiles
Coding profiles are configuration files that consist of numbered sets of parameters that control
the characteristics of the voice and fax traffic over the DSP channels. You can assign at least one
but usually two coding profiles (one for voice and one for fax) to a TCID as a way of providing
quick definition of services over that channel.
Coding profiles can be used by any TCID assigned to a port on a 6100 VDR but only one at a
time.
Vpacket has supplied eight default coding profiles, six for voice and two for fax. Each coding
profile uses one of the major industry standard codecs, including G.711 (A-law 64 kbps), G.711m-
law, G.723 5.3, G.723 6.3, G.726 (ADPCM), and G.729ab as well as two versions of T.38 fax.
Based on these coding profiles, you can create additional coding profiles for a maximum of 32
coding profiles.
Note. G.726 is not supported in H.323.
When the VDR first boots up, all TCIDs are assigned the default coding profile 0 (G.711m- law).
TCID
The TCID represents the telephony (logical) channel associated with each analog port. They are
numbered as integers from 0 to (the number of voice ports on the VDR minus 1). For example,
the 24-port VDR (either 24 analog FXS ports or 24 channels in T1-CAS) has a TCID range of 0-
23.
Figure 1-1 shows the 6100 voice ports, voice port numbers, TCID numbers, and coding profiles.