| Features | | AT&T IP Toll-Free Transfer Connect(IPXC) | |
|
| |  | |
| ANI Support | | yes | |
| Audio Path | | | |
| Always In Audio | | yes | |
| Dynamic Audio | | yes | |
| BHCC Numbers | | no | |
| Call Deflection | | | |
| Forward All | | yes | |
| Forward No Answer | | yes | |
| Call Functionality | | | |
| Conference | | yes | |
| Hold | | yes | |
| Codecs | | | |
| G.711alaw | | no | |
| G.711ulaw | | yes | |
| G.729AB | | yes | |
| Concurrent Calls | | 40+ | |
| Connection Type Tested | | Existing Data Connection | |
| DTMF | | | |
| Inband | | no | |
| RFC 2833 | | yes | |
| Faxing | | | |
| G.711 Fax | | no | |
| T.38 Fax | | Yes, requires call to be G.729 before re-inviting to T.38 | |
| Interaction SIP Proxy | | | |
| Record Route | | no | |
| Supported | | no | |
| Latency | | | |
| Always In | | no | |
| Dynamic | | no | |
| Media Server Support | | yes | |
| Multiple Ports | | no | |
| Redundancy Info | | no | |
| RFC 4028 Timers | | no | |
| SIP Authenication Support | | no | |
| Switch Vendor | | no | |
| Transfer Type | | | |
| Blind | | yes | |
| Consult | | no | |
| Putback (Refer) | | yes | |
| Validation Type | | Tested in ININ Test Lab | |
