[Serusers] problems when going to pstn

[Lucas Aimaretto]

Hi all,

I'm writting to ask for suggestion. I'm able to communicate sip-to-sip
using SER. But when one user wants to talk with somebody in the pstn, I
receive two different errors, depending on the gateway. Look ...

This first message came from a Mera sip server.

U IP_MERA:5060 -> IP_SER:5060
SIP/2.0 415 Unsupported Media Type.
v: SIP/2.0/UDP IP_SER:5060;branch=z9hG4bKad03.0a8597a1.0.
v: SIP/2.0/UDP IP_UA:15172;branch=z9hG4bK2413941036.
Record-Route: <sip:IP_MERA:5060;maddr=38.117.22.34>.
Record-Route: <sip:IP_SER;ftag=2859935538;lr=on>.
f: "1991117" <sip:1991117 at IP_SER>;tag=2859935538.
t: <sip:011543515684778 at IP_SER>;tag=2eff4b002937ff10ff0000045a5b1432.
i: 6ad7a895fbb61ed09f5b2ea36b6612ce at 192.168.1.30.
CSeq: 1 INVITE.
P-Session-Timeout: 7200.
Server: MERA MSIP v.1.0.1.
l: 0.

This one from a cisco AS5350

U IP_CISCO:5060 -> IP_SER:5060
SIP/2.0 400 Bad Request - 'Invalid SDP information'.
v: SIP/2.0/UDP IP_SER;branch=z9hG4bK2817.1aa690e7.0.
v: SIP/2.0/UDP IP_UA:15188;branch=z9hG4bK3914033240.
f: "1991117" <sip:1991117 at IP_SER>;tag=2962826014.
t: <sip:3055383346 at IP_SER>.
i: 332ee2e17a14427caeb2feaf2da22a3a at 192.168.1.30.
CSeq: 2 INVITE.
P-Session-Timeout: 7200.
l: 0.

I do not get it. Why could I communicate sip-to-sip just fine, but, when
going to pstn, I receive this errors. And, moreover, they are different.
I'm only having this error with this particular user, which is behind a
router doing NAT. Do you have any ideas of what could I do to solve this
... ? Or what could be the problem ?

Best regards,

Lucas

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