The problem is caused by a codec negotiation:
Alcatel:
m=audio 32588 RTP/AVP 8 18 97
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=rtpmap:97 telephone-event/8000
SPA:
CC:pc(0)=0 not in codec list
SIP/2.0 488 Not Acceptable Here
Warning: 304 spa "Media type not available"
Can you configure only one codec in both devices, Alcatel and SPA?
E.g. G.711A (a=rtpmap:8 PCMA/8000)