High CPU usage during call between a SIP video phone and an audio only phone

Hello All,

I am currently running an asterisk 16.28.0 server on debian. I noticed the following problem,
If I make a call between an endpoint supporting a video codec and an audio-only endpoint, the CPU increases to 95-100% !

If I make a call between 2 audio-only endpoints (alaw), there is no problem, the same thing between 2 video endpoints (H264). (CPU is at 2-5%)

SIP video Phone : Yealink VP59
Sip audio-only Phone : Yealink T-46G

Please find below the common template for the 2 endpoints :

[endpoint-basic](!)
type=endpoint
disallow = all
allow = alaw
allow = vp8
allow = h264
tos_audio=ef
cos_audio=5
tos_video=af41
cos_video=4
transport=simpletrans
force_rport=yes
rtp_symmetric=yes
rewrite_contact=yes
direct_media=no
language=fr
incoming_mwi_mailbox=yes
send_diversion=no
max_audio_streams=10
max_video_streams=10
context=ctxt-outgoing
subscribe_context=ctxt-outgoing

[auth-userpass](!)
type=auth
auth_type=userpass
 
[aor-single-reg](!)
type=aor
qualify_frequency=30
remove_existing=yes
max_contacts=1

Does anyone have an idea where this issue could come from? Thank you

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