[Serusers] Mediaproxy Call hold/unhold

[tcchan]

Dear All,

I encountered a problem like this.


Case 1:
-------

If UA1 calls UA2 using the following:

Normal call:

UA1 ------invite -------port 30000 -----> UA2

UA1 <--------OK---port 26000--------------UA2

The connection and media is established.




Hold the call:

UA1------invite ---port 30000 (hold)-->  UA2

UA1 <----------OK  port 26000----------UA2

The media is in hold state.


Unhold the call:

UA1------invite ----port 30000--------->UA2

UA1 <---------OK   port 260000----------UA2

Media resume.

The above mentioned work fine with mediaproxy.



Case 2:
-------

If UA1 calls UA2 using the following:

Normal call:

UA1 ------invite -------port 30000 -----> UA2

UA1 <--------OK---port 26000--------------UA2

The connection and media is established.




Hold the call:

UA1------invite ---port 30000 (hold)-->  UA2

UA1 <----------OK  port 26000----------UA2

The media is in hold state.



Unhold the call:

UA1------invite ----port 30001--------->UA2

UA1 <---------OK   port 260000----------UA2

*****Noticed that the reinvite has a different port!


In this situation, media does not resume and mediaproxy has a "stray
hold" session.

I tested case2 without flowing through the mediaproxy and found that the
call can be hold/unhold successfully.  


I am not familiar with RFC at all, please help!

(1)  I would like to know whether it is valid to reinvite with a
different port as in case 2, i.e.,  is the UA1 ill-behave in case 2 when
unhold the call with different port?


(2) Is the mediaproxy designed to work using the some port when
hold/unhold.


Thanks you very much for any help available.


Regards,

TC Chan