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courtschuett
Beginner

Need to Send Early Offer to SIP Phone from CUCM

Using CUCM 10.5 and Cisco 8865/9971 phones with SIP loads.  I have calls going between them successfully and calls to PSTN working correctly.  Calls from the phone to the CUCM and out to PSTN correctly have SDP in the initial INVITE.  However, calls from the CUCM to the phone do not have Early Offer.  Enabling MTP Required on the Device does cause the CUCM to send Early Offer, but that is not a practical solution.

 

Phone -> CUCM - Early Offer

CUCM -> SBC - Early Offer

CUCM -> Phone - Delayed Offer

 

Any ideas?

 

 

2 REPLIES 2

Hi, 

 

You can use Best Effort (No MTP Inserted) for early offer support for voice and video. This will send an early offer by call manager where ever it is possible. you can find below snapshot for better understanding. 

 

early offer.JPG

 

You can find this configuration element in SIP Profile.  

  • Early Offer support for voice and video calls Best Effort (No MTP inserted) — also known as Best Effort Early Offer

Regards,

Shalid

Please rates helpful posts. 

That worked for the CUCM -> SBC INVITE.  I am trying to resolve the CUCM -> Phone INVITE.  Enabling Early Offer (Best Effort) in the SIP Profile did nothing for the INVITE from the CUCM to the Phone.

 

So this works:

 

Phone --EO--> CUCM --EO--> SBC --> PSTN

 

This does not:

 

PSTN --> SBC --EO--> CUCM --DO--> Phone

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