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SIP Release Notes 150 Document #: LTRT-26901
CPE SIP Products
3. The Transparent coder (RFC 4040) poses the following limitations:
• The coder can be used only when using physical terminations
• No detection of IBS (e.g., DTMF)
• Generation of IBS is only toward the network
• No fax/modem detection or generation (i.e., no support for T.38 and Bypass)
A workaround for this constraint is to use the G.711 coder instead.
Product
MP-11x MP-124
Mediant 600 Mediant 1000
Mediant 800 MSBG Mediant 1000 MSBG
Mediant 2000
Mediant 3000/TP-6310 Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410 Mediant 3000 HA/TP-8410
4. When the device is assembled with eight trunks (240 channels) and using the G.729 or
G.711 coder with sample interval of 10 ms, the channel capacity is reduced to seven
trunks (or 210 channels).
Product
MP-11x MP-124
Mediant 600 Mediant 1000
Mediant 800 MSBG Mediant 1000 MSBG
Mediant 2000
Mediant 3000/TP-6310 Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410 Mediant 3000 HA/TP-8410
5. When performing an IP-to-IP call with a wideband (WB) coder on each leg, if the
Fax/Modem Transport type for one of the legs is not Transparent, the interconnection
is made using a narrowband coder, therefore, the wideband quality of the call is not
maintained. The user should avoid setting any Fax/Modem enhanced capabilities on
WB IP-to-IP calls for which the user wants to maintain wideband quality.
Product
MP-11x MP-124
Mediant 600 Mediant 1000
Mediant 800 MSBG Mediant 1000 MSBG
Mediant 2000
Mediant 3000/TP-6310 Mediant 3000 HA/TP-6310
Mediant 3000/TP-8410 Mediant 3000 HA/TP-8410