If i read this correctly 192.168.7.100 is the MCP
192.168.7.101 is the OAS card and 192.168.7.25 is the asterisk box.

First packet the OS is making a call to the asterisk extension "produccion", this also tells the asterisk box to use PCMA (G.711 a-law) codec, and to send audio to 192.168.7.101 on port 30000.

Then we have a progress message from asterisk to os7200

Then we have a ok message from the asterisk box which also tells the OS7200 to send audio to 192.168.7.25 on port 15136 (PCMA Codec)

Etc

You have only captured the signalling which looks ok. Can you get another one with the audio packets as well?