With 2 E1's you will be using 60 channels.
(at full capacity) so you wont have too much for Transcoding sessions available with your
PVDM2-64 (64 channels).
Normally for Transcoding it is possibly to support 16 XCODE sessions when XCODING between
2 low-complexity codecs, since this istuation is rare, the practical number of XCDOING sessions per DSP is 8.
"I understand the DSPs can share the function of voice termination and transcoding (but dedicated DSPs are required for MTP or conferencing)."
You are correct, but for being more clear this means that PVDM2 (C5510 DSP)
can provide both functions simultaneously.
Conferencing is statically defined, and a C5510 DSP that is configured for CONF cannot server any other function.
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_implementation_design_guide_chapter09186a0080637427.html#wp1043113
The best solution to this is to add additional PVDM2 to the GW.
For configuration check this:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vvfax_c/callc_c/ccm_c/intcnf2.htm#wp1059545
