Asterisk not sending proper rtp packet size when using TTS from LumenVox over MRCTv1

i am using TTS on asterisk using Lumenvox over MRCPv1.
When I make the call from my ipphone to Asterisk generate the TTS output from lumenvox, Asterisk sends RTP with UDP length 100 bytes to the ipphone instead of 180 bytes.
It receives 180 bytes from lumenvox.
However if I play audio using recorded files it works fine.
Can you please guide what could be causing this.

Attaching 2 pcaps one for each case (renamed to .txt).

TTS.txt (1.2 MB) Recorded File.txt (843.5 KB)

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