** Technical **

* Section 3, pages 3-4:
>    Intended algorithm for mcpttq is queuing.
> 
>    New Warning code: No.
> 
>    New SIP response code: No.

Is this kind of thing really needed/required in the registry?



** Editorial **

* Section 1, page 2:
>    The third generation partnership project (3GPP)

May be you should capitalize these? (i.e., "Third Generation...")


* Section 1, page 2:
> In addition to this a commercial PTT
>    service for non-professional use (e.g., groups of people on holiday)

Please insert a comma after "this".


* Section 1, page 3:
> MCPTT data transfer currently under development can
>    benefit from a queueing mechanism.

"data transfer..." protocols?


* Section 2, page 3:
> The use of this namespace outside such network is
>    undefined.

s/network/networks/


* Section 5, page 5:
> 5.  IANA Considerations
> 
>    Abiding by the rules established within [RFC4412] and [RFC7134], this
>    is an Informative RFC registering two new namespaces, their
>    associated priority-values, and intended algorithms.

s/registering/creating/ ?