Ring group failing intermittently

In a customer’s setup, I have an external number and 2 extensions in a ring group.
138201 is connected to a Yealink IP Phone and 138202 is connected to a Grandstream.
On most occasions extension 138201 will ring together with the other phones however many times it will not. On the occasions that 138201 doesn’t wring, the following will show in the CLI:

== Using SIP RTP TOS bits 184
== Using SIP RTP CoS mark 5
– Called SIP/BHcom/138979504191560
– SIP/138202-00068e59 is ringing
– SIP/138201-00068e58 connected line has changed. Saving it until answer for SIP/xxxxx-00068e57
– SIP/138201-00068e58 is ringing
== Extension Changed 138201[ext-local] new state Ringing for Notify User 138202

Can anyone shed some light on the what is happening here?

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