We have been using CCM 5.0.4 since four months below is the call flow topology
IP Phones--CCM-- IP-IP GW - Manage Voip Link --SP
We have purchased VOIP minutes from Service Provider on the manage voip link which basically terminates calls originated from india to US PSTN.
Now this link works on h.323 and works fine for hold/resume/transfer or the matter of fact any thing.
We are trying to integrate backup line with IP IP gateway from different SP which runs on SIP. We have same gateway configured on CCM and on IP IP gateway we are using "allow connections h323 to sip and vice versa" outbound call works fine. however the moment we are putting the call on hold and than resume calls disconnets after 5 secs with no audio and the same is with Transfer option.
I have seen the debugs and from the debugs i see disconnect cause code is 47 which means no resources.
I have doublechecked that we have MRGL which has MRG and which has hardware transcoder, hardware mtp/sw mtp and conference resources as well.
The same MRGL is assigned to the main link which is working fine.
And FYI we dont have MTP required on the gateway level. When we do that hold/resume/transfer button become disable.
There is some configuration which i am missing but i am unable to figure out what i am missing. This is farely simple but its not working for me.