the underlying limits are given by the dejitter-buffer in use and the total end-to-end delay maximum.
The total end-to-end delay should be (ITU G.114 recommendation) below 150 ms. Please understand, that this is not a hard limt, even 250 ms can be ok. The is a good potion of "psychology" within voip - some users might accept it, some not.
A dejitter-buffer counts against this limit. Per default you have usually a buffer of 30 ms. Jitter below this will be handled by the buffer, which should result in no degradation of voice quality.
Your 7 ms are well within the limits and there should be no noticeable effect for your users.
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