Can't send im to lync mobile client after a period of chating

Thanks for your help first.
I'm setting Lync 2013 server, all internal lan function are working fine, except mobile client.
I've setup edge, reverse proxy (using IIS), FE, BE server.
For IM between between desktop lync client, it is working fine.
For IM between mobile lync client and mobile client with desktop lync cleint, I found the following issue:
- between mobile lync client and lync desktop client: The IM function is working sent between both party, no matter it is initial send from mobile or desktop client, but after a random period of time, may be 5 mins or 7 mins or 10 mins, the desktop client
will not able to send IM to the mobile client but the mobile client still able to send IM to desktop client.
- for between lync mobile client
the issue as above.
- between desktop lync client
no such issue found
I've trouble shoot this issue a lot but still can't the root cause?
Do you have any idea?
Many thanks for your help?
I know that when I testing using my mobile phone, my 3G network provider will continuous change my mobile ip address after a period time, does this behaviour will affect Lync server to find the mobile device?
are there any method will Lync server know what the mobile client status and ip address  that let Lync server can find the mobile device effectively?
Patrick

I know that when I testing using my mobile phone, my 3G network provider will continuous change my mobile ip address after a period time, does this behaviour will affect Lync server to find the mobile device?
Hi,
Would you please tell us which edition of mobile did you use (Android, IOS or Windows Phone)?
As IPhone and Windows Phone need push notification function but Android Phone doesn’t need.
If possible, you can test with two Android Phone to check if the issue happen with push notification function.
From your description above, it seems that you use 3G network on mobile to connect Lync mobile client. Please check if the issue cause by IP address of mobile, you can change network to a WIFI to have a test.
Also, please double check if the needed ports open as Edwin provided above.
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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