One of our customer has 3825 VG with PVDM2-64 with VWIC2-2MFT-T1/E1 and was using only one E1 PRI, now customer requested to add another E1 PRI on this VG, when trying to add/confirgure, router was throwing DSP resource error, so I shutdown conference & transcode resource i.e DSP farm on this router, hence I successfully added another PRI, so my question is that will this router support in SRST mode as I have below config for SRST mode as DSP resource fully used by 2 PRI's
max-conferences 8 gain -6
ip source-address X.X.X.X port 2000
system message primary Press "#" after dialing
Its as simple as this, if you have 31- Channels on the E1-PRI 30 B- channels and 1 D-channel for signalling.
The concept is the same with dsp's "PVDM2-64" has 64 channels. So if you use 1 E1-port of the "VWIC2-2MFT-T1/E1" you'll consume 31 channels of the ""PVDM2-64" 64 - 31 if you using 2 E1 ports.
Then this would be 62 Channels consumed of the "PVDM2-64".
So yes would had to reduce or shutdown the "conference/transcoder" resource on the Gateway.
To answer your question about this affecting anything in SRST. No it wont affect anything.
All you need to do it fix your dial-peers for incoming and outoing calls in SRST for the 2nd E1-PRI that you have configured.
When phones register to CUCM , are they using DSP resources from the same gateway for conferencing and transcoding etc?
If not then you should be okay with SRST.thanks